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OF THE



SIXTY-FIEST MEETING



BRITISH ASSOCIATION



FOR the;



ADYANCEIENT OF SCIENCE



HELD AT



CARDIFF IN AUGUST 1891. A



AMERIC^'^^ffel NOLOGY

.>''6006

isee

LII5 K AH Y



LONDON :
OHK MUREAY, ALBEMARLE STREET.



OFFICE OF THE ASSOCIATION : BtJBLlNGTON BOUSE. LONDON, W.



-Be
5o.42eT



SPOTTISWOODE and CO., NEW-STREET SQUARE
lOXDOT?



CONTENTS.



Page
Objects land Rules of tlie Association ., xxiv

Places and Times of Meeting and Officers from commencement xxxiv

Presidents and Secretaries of tlie Sections of the Association from com-
mencement xliii

List of Evening Lectures. Ix

Lectures to the Operative Classes Ixiii

Officers of Sectional Committees present at the Cardiff Meeting.., , Ixiv

Treasurer's Account Ixvi

Tahle showing the Attendance and Receipts at the Annual Meetings Ixviii

Officers and Council, 1891-92 Ixx

Report of the Council to the General Committee Ixxi

Committees appointed by the General Committee at the Cardiff Meeting

in August 1891 Ixxvi

Other Resolutions adopted by the General Committee Ixxxiv

Resolutions referred to the Council for consideration, and action if

desirable Ixxxiv

Synopsis of Grants of Money Ixxxv

Places of Meeting in 1892 and 1893 Ixxxvi

General Statement of Sums which have been paid on account of Grants

for Scientific Purposes Ixxxvii

General Meetings c



Address by the President, William HtJGGiNS, Esq., D.C.L.,LL.D., Ph.D.,

F.R.S., F.R.A.S., Hon.F.R.S.E., &c. 3

a2



IV CONTENTS.



REPORTS ON THE STATE OF SCIENCE.



Page
Keport of the Correspondin? Societies Committee, consisting of Mr, Francis
Galton (Chairman), Professor A. W. Willtamsox, Sir Dotjglas Galton,
Professor Boyd Dawkins, Sir Rawson Rawson, Dr. J. G. GARSorf, Dr.
JoHif Eyans, 3Ir. J. IIoPKiNso.Y, Professor R. MeldoLa (Secretary), Pro-
fessor T. G. BoifNEr, Mr. W. Whitaker, Mr. G. J. Stjio's, General Piit-
RlVEES, and Mr. W. Topley 41

Report of a Committee, consisting of Messrs. J. Lakmoe and G. H. Betas',
appointed to draw up a Report on the present state of our Ijnowledge of
Thermodynamics, specially with regard to the Second Law 85

Sixth Report of the Committee, consisting of Professors Fitzgerald (Chair-
man), Armstrong, and 0. J. Lodge (Secretaries), Sir AViLLiAii Thomson,
Lord Ratleigh, J. J. Thomson, Schuster, Potnting, Critm Brown,
Ramsay, Fkanexand, Tilden, Hartley, S. P. Thompson, McLeod,
Roberts- Austen, Rucker, Reinold, Carey Foster, and H. B. Dixon,
Captain Abney, Drs. Gladstone, Hopeinson, and Fleming, and Messrs.
Orookes, Shelford Bidwell, W. N. Shaw, J. Larmor, J. T. Bottomley,
R. T. Glazebrook, J. Brown, and John M. Thomson, appointed for the
purpose of considering the subject of Electrolysis in its Physical and Chemical
Bearings 122

Eleventh Report of the Committee, consisting of Sir AVilliam Thomson, Mr.
R. Etheridge, Professor John Perry, Dr. Henry "Woodward, Professor
Thomas Gray, and Professor John Milne (Secretary), appointed for the
purpose of investigating the Earthquake and Volcanic Phenomena of
Japan. (Drawn up by the Secretary) 123

Second Report of the Committee, consisting of Lord Rayleigh, Sir William
Thomson, Professor Cayley, Professor B. Price, Dr, J. W. L. Glaisher,
Professor A. G. Greenhill, Professor W. M. Hicks, and Professor A.
Lodge (Secretary), appointed for the purpose of calculating Tables of cer-
tain Mathematical Functions, and, if necessary, of taking steps to carry out
the Calculations, and to publish the results in an accessible form 129

First Report of the Committee, consisting of Mr. G. J. Symons (Chairman),
Professor R. Meldola, Mr. J. Hopeinson, and Mr. A. W. Clayden
(Secretary), appointed to consider the application of Photography to the
Elucidation of Meteorological Phenomena. (Drawn up by the Secretary) 130

Report of the Committee, consisting of Professor O. J. Lodge, Professor Cakey
Foster, and Mr. A. P. Ohattoce (Secretary), appointed to investigate the
Discharge of Electricity from Points 139

Report of the Committee, consisting of Lord McLaren (Chairman), Professor
Crum Brown (Secretary), Mr. Milne-Home, Dr. John Murray, Dr.
Buchan, and the Hon. Ralph Abercromby, appointed for the purpose of
co-operating wilh the Scottish Meteorological Society in making Meteoro-
logical Observations on Ben Nevis 140

Third (Interim) Report of the Committee, consisting of Professor Fitzgerald,
Dr. John Hopeinson, Mr. R. A. Hadfield, Mr. Trouton, Professor
RoBERTS-AusTEN, Mr. H. F. Newall, and Professor Barrett (Secretary),
on the various Phenomena connected with the Recalescent Points in Iron
and other Metals 147



CONTENTS. V

Page
Second (Interim) Report of the Committee, consisting of Dr. John Kerr, Sir
William Thomson, Professor Rucker, and Mr. R. T. Glazebrook (Secre-
tary), appointed to co-operate with Dr. Kerr in his researches on Electro-
optics 147

Report of the Committee, consisting of Professor Liteing, Dr. C. PiAzzi
Smyth (Secretary), and Professors Dewar and Schtjstee, appointed to
co-operate with Dr. C. PlAZZi Smyth in his researches on the Ultra-violet
Rays of the Solar Spectrum 147

Report of the Committee, consisting of Professor W. Grylls Adams (Chair-
man and Secretary), Sir William Thomson, Professor G. H. Darwin,
Professor G. Ohrystal, Professor A. Schuster, Professor RiJCKER, Mr. C. H.
Carpmael, Commander Creak, the Astronomer Royal, Mr. William
Ellis, and Mr. G. M. Whipple, appointed for the purpose of considering
the best means of Comparing and Reducing Magnetic Observations 149

Report of the Committee, consisting of Professor G. Carey Foster, Sir
William Thomson, Professor Ayrton, Professor J. Perry, Professor W.
G. Adams, Lord Rayleigh, Dr. 0. J. Lodge, Dr. John Hope:inson, Dr.
A. MxriRHEAD, Mr. W. H. Preece, Mr. Herbert Taylor, Professor Everett,
Professor Schuster, Dr. J. A. Fleming, Professor G. F. Fitzgerald,
Mr. R. T. Glazbbrook (Secretary), Professor Chrystal, Mr. H. Tomlin-
SON, Professor W. Garnett, Professor J. J. Thomson, Mr. W. N. Shaw,
Mr. J. T. BoTTOMLEY, and Mr. T. Gray, appointed for the purpose of
constructing and issuing Practical Standards for use in Electrical Measure-
ments 1 52

Interim Report of the Committee, consisting of Professor Cayley, Professor
Sylvester, Mr. A. R. Forsyth, and Professor A. Lodge (Secretary), ap-
pointed for the purpose of carrying on the Tables connected with the Pellian
Equation from the point where the work was left by Degen in 1817 160

Seventh Report of the Committee, consisting of Sir G. G. Stokes (Chairman),
Professor Schuster, Mr. G. Johnstone Stoney, Sir H. E. Roscoe, Captain
Abney, Mr. Whipple, Professor McLeod, and Mr. G. J. Symons (Secre-
tary), appointed for the purpose of considering the best methods of recording
the direct Intensity of Solar Radiation 100

Report of the Committee, consisting of Sir H. E. RoscoE, Mr. J. N. Lockyer,
Professors Dewar, Wolcott Gibbs, Livbing, Schuster, and W. N.
Hartley, Captain Abney, and Dr. Marshall Watts (Secretary),
appointed to prepare a new series of AVave-length Tables of the Spectra of
the Elements and Compounds 161

Interim Report of the Committee, consisting of Professor Thorpe, Professor
Hummel (Secretary), Dr. Perkin, Professor Russell, Captain Abney, and
Professor Stroud, on the Action of Light upon Dyed Colours. (Drawn up
by the Secretary) 263

Report (provisional) of a Committee, consisting of Professors McLeod and
W. Ramsay and Mr. W. A. Shenstonb (Secretary), appointed to investigate
the Influence of the Silent Discharge of Electricity on Oxygen and other
Gases 264

Third Report of the Committee, consisting of Professors H. McLeod (Chair-
man), RoBERTs-AusTEN (Secretary), and Reinold and Mr. H. G. Madan,
appointed for the Continuation of the Bibliography of Spectroscopy 264

Fifth Report of the Committee, consisting of Professor Tilden and Professor
Armstrong (Secretary), appointed for the purpose of investigating Isomeric
Naphthalene Derivatives. (Drawn up by Professor Armstrong) 265

Fifth Report of the Committee, consisting of Professors Tilden, McLeod,
Pickering, Ramsay, and Young and Drs. A. R. Leeds and Nicol



VI CONTENTS.

Page
CSeeretary), appoiuted for the purpose of reporting on the Bibliography of
Solution 273

Fifth Report of the Committee, consisting of Professors Tilden and Ramsay
and Dr. NicoL (Secretary), appointed for the purpose of investigating the
Properties of Solutions 273

Tliird Report of the Committee, consisting of Professor Robeets-Austen
(Chairman), Sir F. Abel, Messrs. E. Riley and J. Spiller, Professor J. W.
Langlex, Mr. G. J. Sneltjs, Professor Tildek, and Mr. Thomas Turxer
(Secretary), appointed to consider the best method of establishing an Inter-
national Standard for the Analysis of Iron and Steel. (Drawn up by the
Secretary) 273

Report (provisional) of a Committee, consisting of Professors H. E. Aem-
STROis^G and W. R. Dunstak and Messrs. C. H. Bothamley and W. A.
Shensto:se (Secretary), appointed to investigate the direct formation of
Haloid Compounds from pure materials 274

Provisional Report of the Committee, consisting of General Festing, Captain
Abijey, and Professor H. E. Armstkong (Secretary), on the Absorption
Spectra of Pure Compounds 275

Kineteenth Report of the Committee, consisting of Professor Prestwich, Dr.
PI. W. Crosskey, Professors W. Boyd Dawkins, T. McKenny Hughes,
and T. G. Bonney, and Messrs. C. E. De Range, W. Pengelly, J. Plant,
and R. H. Tiddeman, appointed for the purpose of recording the Position,
Height above the Sea, Lithological Characters, Size, and Origin of the Erratic
Blocks of England, Wales, and Ireland, reporting other matters of interest
connected with the same, and taking measures for their preservation.
(Drawn up by Dr. Crosskey, Secretary) 276

Second Report of the Committee, consisting of Dr. H. Woodwabd (Chair-
man), Rev. G. F. Whidboene, Messrs. R. Etheridge, R. Kidston, J. E.
Marr, C. D. Sherbokn, and A. S. Woodward (Secretary), for the Regis-
tration of all the Type Specimens of British Fossils 299

Seventeenth Report of the Committee, consisting of Drs. E. PItjll and
H. W. Crosskey, Sir Douglas Galton, Professor G. A. Lebour, and
Messrs. James Glatshek, E. B. Marten, G. H. Moeton, J. Parker, W.
Pengelly, James Plant, J. Prestwich, I. Roberts, C. Fox-Strangeways,
T. S. Stooke, G. J. Symons, W. Toplby, Tyld en- Wright, E. Wethe-
ked, W. Whitaeler, and C. E. De Range (Secretary), appointed for the
purpose of investigating the Circulation of Underground Waters in the
Permeable Formations of England and Wales, and the Quantity and Character
of the Water supplied to various Towns and Districts from these Forma-
tions. (Drawn up by C. E. De Range, Reporter) 300

Report of the Committee, consisting of Messrs. H. Bauerman, F. W. Rudler,
and J. J. H. Teall and Dr. Johnston-Lavis, appointed for the investigation
of the Volcanic Phenomena of Vesuvius and its neighbourhood, (Drawn
up by Dr. Johnston-Lavis) 312

Second Report of the Committee,consistingof Professor James Geieie (Chair-
man), Dr. Tempest Anderson, Dr. Valentine Ball, Mr. James E. Bed-
ford, Professor T. G. Bonney, Professor W. Boyd Dawkins, Mr. James W.
Davi'>, ?tr. William Gray, Mr. Robert Kidston, Mr. Arthur S. Reid,
Mr. R. H. Tiddeman, Mr. W. W. Watts, Mr. Horace B. Woodward, and
Mr. Osmund W. Jeffs (Secretary), to arrange for the collection, preserva-
tion, and systematic registration of Photographs of Geological Interest in
the United Kingdom. (Drawn up by the Secretary) 321

Report of the Committee, consisting of Mr. G. J. Symons, Mr. C. Davison
(Secretary), Sir F. J. Bramwell, Mr. E. A. Cowpeb, Professor G. H. Dar-
win, Professor Ewing, Mr. Isaac Roberts, Mr. Thomas Gray, Dr. John



CO'NTENTS. Vll

Page
Evans, Professors Pbestwich, Hull, Lebotje, Meldola, and Judd, Mr. M.
Walton Brown, and Mr. J. Glaisher, appointed to consider the advisa-
bility and possibility of establisliino;' in other parts of the country Observa-
tions upon the Prevalence of Earth Tremors similar to those now being
made in Durham in connection with coal-mine explosions 333

E,eport of the Committee, consisting of Dr. H. Woodward (Chairman),
Messrs. W. D. Crick, T. G. George, Wm. Httll, E. A. Walford, E.
Wilson, H. B. Woodward, and Beeby Thompson (Secretary), to work
the very Fossiliferous Transition Bed between the Middle and Upper Lias
in Northamptonshire, in order to obtain a more clear idea of its fauna, and
to fix the position of certain species of fossil fish, and more fully investigate
the horizon on which they occur. (Drawn up by the Secretary) 334

Keportof the Committee, consisting of Mr. J. W. Davis (Chairman), Rev. E.
Jones (Secretary), Drs. J. Evans and J. G. Garson, and Messrs. W. Pen-
gellt, R. H. Tiddeman, and J. J. Wilkinson, to complete the investiga-
tion of the Cave at Elbolton, near Skipton, in order to ascertain whether
Remains of Palseolithic Man occur in the Lower Cave Earth 351

Report of the Committee, consisting of Dr. John Evans (Chairman), Mr. B.
Harrison (Secretary), and Professors J. Prestwich and H. G. Seelet,
appointed to carry on excavations at Oldbury Hill, near Ightham, in order
to ascertain the existence or otherwise of Rock-shelters at this spot. .
(Drawn up by Mr. B. Harrison) 353

Fourth Report of the Committee, consisting of Professor Flower (Chairman),
Mr. D. Morris (Secretary), Mr. Carrtjthers, Dr. Sclater, Mr. Thiselton-
Dter, Dr. Sharp, Mr. F. Du Cane Godjian, Professor Newion, Dr,
GiJNTHER, and Colonel Feilden, appointed for the purpose of reporting
on the present state of our knowledge of the Zoology and Botany of the
West India Islands, and taking steps to investigate ascertained deficiencies
in the Fauna and Flora 354

Draft of Report of the Committee, consisting of Professor Flower (Chair-
man), Mr. D. Sharp (Secretary), Dr. Blanford, Df. Hickson, Professor
Newton, Professor Riley, Mr. O. Salvin, and Dr. Sclater, appointed to
report on the present state of our knowledge of the Zoology of the Sand-
wich Islands, and to take steps to investigate ascertained deficiencies in the
Fauna 357

Fifth Report of the Committee, consisting of Professor Foster, Professor
Bayley Balfour, Mr. Thiselton-Dyer, Dr. Trimen, Professor Marshall
Ward, Mr. Carruthees, Professor Hartog, Mr. Walter Gardiner, and
Professor Bower (Secretary), appointed for the purpose of taking steps for
the establishment of a Botanical Laboratory at Peradeniya, Ceylon 358

Fourth Report of the Committee, consisting of Mr. A. W. Wills (Chairman),
Mr. E. W. Badger, Mr. G. Claridgb JDruce, and Professor Hillhouse,
for the purpose of coUectinsr information as to the Disappearance of Native
Plants from their Local Habitats. (Drawn up by Professor Hillhouse,
Secretary) 359

Report of a Committee, consisting of Professor Newton, Mr. John Cordeaux
(Secretary), Messrs. John A. Harvie-Brown, R. M. Barrington, W.
Eagle Clarke, and the Rev. E. P. Knubley, appointed at Leeds to make
a digest of the observations on the Migration of Birds at Lighthouses and
Light- vessels, which have been carried on by the Migration Committee of
the British. Association, and to report on the same at Oardiif 363

Report of the Committee, consisting of Professor Flower (Chairman), Pro-
fessor M. Foster, Professor Ray Lankester, Professor Vines, and Mr. S. F.
Haemee (Secretary), appointed for the purpose of arranging for the occupa-



VIU CONTENTS.

Page
tion of a Table at the Laboratory of the Marine Biological Association at
Plymouth 364

Keport of the Committee, consisting of Dr. P. L. Sclateb, Professor Rat
Laxkjister, Professor Cossar Eavart, Professor M. Foster, IVIr. A.
Sedgwicit, Professor A. M. jMarshall, and Mr. Percy Sladen (Secre-
tary), nominated for the purpose of arranging for the occupation of a Table
at the Zoological Station at Naples 3G5

Report of the Committee, consisting of Professor A. C. IIaddox, Professor
W. A. IIekdman, and Mr. "\V. E. IIoylb (Secretary), appointed for im-
proving and experimenting with a Deep-sea Tow-net, for opening and
closing under water 382

Report of the Committee, consisting of Dr. J. H. Gladstone (Chairman),
Professor H. E. Armstrong (Secretary), Mr. S. Bourne, Dr. Crosskey,
Mr. G. Glabstone, Mr. J. Heywood, Sir John Lubbock, Sir Philip
Magnus, Professor N. Story Maskelyne, Sir H. E. Roscoe, Sir R. Temple,
and Professor S. P. Thompson, appointed for the purpose of continuing the
inquiries relating to the teaching of Science in Elementary Schools 383

Third Report of the Committee, consisting of Sir J. N. Douglass, Professor
Osborne Reynolds, Professor AV. C. Unwin, and Messrs. W. Topley,
E. Leader Williams, W. Sifelford, G. F. Deacon, A. R. Hunt, W. H.
Wheeler, W. Anderson, and H. Bamford, appointed to investigate the
Action of Waves and Currents on the Beds and Foreshores of Estuaries by
means of Working Models 386

Report of the Committee, consisting of Professor Flower (Chairman), Dr.
Garson (Secretary), Dr. Beddoe, General Pitt-Rivers, Mr. Francis
Galton, and Dr. E. B. Tylor, appointed for the purpose of editing a new
Edition of ' Anthropological IN'otes and Queries' 404

Report of the Committee, consisting of Professor Flower (Chairman), Di*.
Garson (Secretary), Mr. Bloxam, and Dr. Wilberforce Smith, for the
purpose of carrying on the work of the Anthropometric Laboratory 405

Seventh Report of the Committee, consisting of Dr. E. B. Ttlok, Mr. G. W.

Bloxam, Sir Daniel Wilson, Dr. G. M. Dawson, and Mr. R. G.

Haliburton, appointed to investigate the physical characters, languages,

• and industrial and social condition of the North-Western Tribes of the

Dominion of Canada 407

Fifth Report of the Committee, consisting of Sir John Lubbock, Dr. John
EvA'NS, Professor W. Boyd DAWxrNS,Dr. R. Munro, Mr. W. Pengelly, Dr.
Henry Hicks, Professor Meldola, Dr. Muirhead, and Mr. James W.
IJavis, appointed for tne purpose of ascertaining and recording the localities
in the British Islands in which evidences of the existence of Prehistoric
Inhabitants of the country are found. (Drawn up by Mr. James W. Davis) 449

Fourth and Final Report of the Committee, consisting of the Hon. Ralph
Abercromey, Dr. A. Buchan, Mr. J. Y. Buchanan, Mr. J. Willis Bund,
Professor Chrystal, Mr. D. Cunningham, Professor Fitzgerald, Dr. H. R,
Mill (Secretary), Dr. John Murray (Chairman), Mr. Isaac Roberts,
Dr. H. C. SoRBY, and the Rev. C. J. Steward, appointed to arrange an in-
vestigation of the Seasonal Variations of Temperature in Lakes, Rivers, and
Estuaries in various parts of the United Kingdom in co-operation with the
local societies represented on the Association. (Drawn up by Dr. H. R.
Mill) 454

On the Capture of Comets by Planets, especially their Capture by Jupiter.
By Professor H. A. Newton 511

The Recent Progress of Agriculture in India. By C. L. Tupper 532



CONTENTS. IX



TRANSACTIONS OF THE SECTIONS.



Section A.— MATHEMATICAL AND PHYSICAL SCIENCE.

THURSDAY, AUGUST 20.

Page
Address by Professor Oliyee J. Lodge, D.Sc, LL.P., F.R.S., President of the

Section 547

1. Interim Report of the Committee on Phenomena connected with

Recalescence 567

2. On the Action of a Planet upon small Bodies passing near the Planet,

with special reference to the Action of Jnpiter upon such Bodies, By
Professor H. A. Newton 557

3. On the Absorption of Heat in the Solar Atmosphere, By W. E. Wilson,
M.R.I,A., r,R.A,S 557

4. The Ultra-Violet Spectrum of the Solar Prominences. By Professor
Geoe<je E. Hale, Director of the Kenwood Physical Observatory,
Chicago 557

5. Report on Researches relative to the Second Law of Thermodynamics,

By Dr. J. Lakmoe and G. H. Betan ,.... = ,., 558

6. Note on a Simple Mechanical Representation of Carnofs Reversible

Cycle, By G, H, Betan 658



FRIBA Y, A UG UST 2 1 .

1, Literim Report of the Committee on Researches in Electro-optics 568

2, Note on the Electromagnetic Theory of the Rotation of the Plane of
Polarised Light. By Professor A. Geat, M. A., F.R.S.E 558

3, On an Experiment on the Velocity of Light in the neighbourhood of

rapidly-moving Matter. By Professor Olivee J, Lodge, F.R.S 660

4, The Action of Electrical Radiators, with a Mechanical Analogy, By

J, Laemoe 660

5, On the Measurement of Stationary Hertzian Oscillations along Wires, and
the Damping of Electric Waves. ' By Professor D. E. Jones, B.Sc 561

6, On the Propagation of Electromagnetic Waves in Wires. By Waltee
Thoep 562

7, On Reflection near the Polarising Angle from the Clean Surfaces of
Liquids, By LoED Ratleigh, Sec.R.S 563



SATURDA Y, A UG UST 22.
Depaetment I, — Phisics.

L Sixth Report of the Committee on Electrolysis 564

2, Interim Report on the present state of our Knowledge in Electrolysis
and Electro-Chemistry 664



X CONTENTS.

Page

3. Electrolytic Problems. By Robert L. Mond 564

4. On Clausius' Theory of Electrolytic Conduction, and on some Secret
Evidence for the Dissociation Theory of Electrolysis. By J. Brown ... 5G4

5. Report of the Committee on the Phenomena accompanying the Discharge

of Electricity from Points 565

6. On the Electrification of Needle Points in Air. By A. P. Chattock 5G5

7. On the Measurement of Liquid Resistances. By J. Swinburne 6Go

8. The Surface-Tension of Ether and Alcohol at Different Temperatures.

By Professor William Ramsay, Ph.D., F.R.S 565



Department II. — Mathematics.

1. Interim Report of the Committee on Mathematical Functions 506

2. Interim Report of the Committee on the Pellian Equation Tables 506

3. On Periodic Motion of a Finite Conservative System. By Sir William
Thomson, Pres.R.S 500

4. On a Geometrical Illustration of a Dynamical Theorem. By Sir Robert
Ball, F.R.S .566

5. On the Transformation of a Differential Resolvent. By the Rev. Robert
IIarley, M.A., F.R.S 566

0. On the Transformations used in connection with the Duality of Diflferential
Equations. By E. B, Elliott, F.R.S 568

7. Note on a Method of Research for Invariants. By E. B. Elliott, F.R.S. 568

8. On Liquid Jets under Gravity. By Rev. H, J. Sharpe, M.A 668

9. The Geometry of Confocal Conies. By Professor T. C. Lewis 570

10. Some Tangential Transformations, including Laguerre's Semi-Droites

R6ciproques. By Professor R. W. Genese, M.A 571

11. Note on the Normar to a Conic. By R. H. Pinkerton 572

12. On the Importance of the Conception of Direction in Natural Philosophy.

By E. T. Dixon 572



HONDA Y, A UGUST 24.

1. Report of the Committee on Researches on the Ultra-Violet Rays of the

Solar Spectrum 573

2. Comparison of Eye and Hand Registration of Lines in the Violet and

Ultra-Violet of the Solar Spectrum, against Photographic Records of
the same, with the same Instrument, after a lapse of several vears. By
C. Piazza Smyth, LL.D., F.R.S.E '. 673

3. Note on Observing the Rotation of the Sun with the Spectroscope. By

G. Johnstone Stoney, M.A., D.Sc, F.R.S 673

4. On the Cause of Double Lines in Spectra. By G. Johnstone Stoney,

M.A., D.Sc, F.R.S 574

5. Seventh Report of the Committee on Solar Radiation 575

6. Report of the Committee on Meteorological Photography 575



CONTENTS. XI

Page

7. Report of the Committee on the Meteorological Observations on Ben
Nevis 675

8. Report of the Committee on the Reduction of Magnetic Observations 575

9. Report of the Committee on the Seasonal Variations in the Temperature

of Lakes, Rivers, and Estuaries 576

10. On the probable Nature of the Bright Streaks on the Moon. By Dr.

Ralph Copeland, F.R.A.S., F.R.S.E 576



TUESBA Y, A UG UST 25.

1. Report of the Committee on Electrical Standards 576

2. The Causes of Variation of Clark Standard Cells. By J. Swinburne ... 576

3. Joint Discussion with Section Ox on Units and their Nomenclature,
opened by Professor Olivek J. Lodge, F.R.S., followed by W. H. Peeeoe,
F.R.S 577

Some Revolutionary Suggestions on the Nomenclature of Electrical
and Mechanical Units. By Professor W. Stkotjd 577

On a Table to facilitate the Conversion of Electrostatic and Electro-
magnetic Measures into one another. By G. Johnstone Stonet,
M.A.,D.Sc., F.R.S 577

Ahsolute Units of Measurement. By W. Moon 580



WEDNESDAY, AUGUST 26.

L On the Measurement of Lenses. By Professor Silvanus P. Thompson,
F.R.S 580

2. On a new Polariser. By Professor Silvanus P. Thompson, F.R.S 580

3. Some Experiments on a new Method for the Determination of ' v.' By

A. G. Webster 580

4. On the Magnetic Field in the neighbourhood of the South London Elec-
trical Railwav. By Professor W. E. Atrton, F.R.S., and Professor
RxJCKER, F.R.S 581

5. On the Periodic Time of Tuning-Forks maintained in Vibration Electric-



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