196 
NATURE 
[APRIL 15, I9T5 

fication of radiographic images utilisable for the local- 
isation of projectiles in the tissues.—Pierre Delbet and 
H. Vaquez: Chondrectomy in certain irreducible dila- 
tions of the right heart. 
BOOKS RECEIVED. 
British Museum (Natural History). Report on 
Cetacea Stranded on the British Coasts during 1914. 
Pp. 16. (London: British Museum (Natural History) ; 
Longmans and Co.) ts. 6d. 
British Museum (Natural History). British Ant- 
arctic (Terra Nova) Expedition, 1910. Natural History 
Report. Zoology. Vol. i., No. 2. Natural History 
of the Adelie Penguin. By Staff-Surgeon G. Murray 
Levick. Pp. 55-84+plates i-xxi. (London: British 
Museum (Natural History); Longmans and Co.) 5s. 
Memoir on the Economic Geology of Navanagar 
State in the Province of Kathiawar, India. By E. H. 
Adye. Pp. xxvi+262. (Bombay: Thacker and Co., 
Ltd.) 
The Manchester Museum. Museum Handbooks : 
The Stela of Sebek-khu. By T. E. Peet. Pp. 21. 
(Manchester: University Press.) 2s. 
The Plateau Peoples of South America. 
Adams. Pp. 134. (London: 
Sons, Ltd.) 3s. 6d. net. 
An Amateur’s Introduction to Crystallography. By 
Sir W. P. Beale. Pp. viit+220. (London: Long- 
mans and Co.) 4s. 6d. net. 
The Panama Canal. By R. E. Balenhus, 
H. S. Knapp, and Dr. E. R. Johnson. Pp. xi+257. 
(New York: J. Wiley and Sons, Inc.; London: 
Chapman and Hall, Ltd.) tos. 6d. net.. 
Heating and Ventilating Buildings. By Prof. R. C. 
Carpenter. Sixth edition. Pp. xiv+598. (New York: 
J. Wiley and Sons, Inc.: London: Chapman and 
Hall, Ltd.) 15s. net. 
By A. A. 
G. Routledge and 
Capt. 
DIARY OF SOCIETIES. 
THURSDAY, Apriv ts. 
Rovat InsTiTUTION, at 3.—The System of the Stars; Star Colour and its 
Significance: Prof. A. S. Eddington. 
INSTITUTION OF ELECTRICAL ENGINFERS, at 8.—The Power Supply of 
the Central Mining-Rand Mines Group: J. H. Rider. 
LINNEAN Society. at 5.—Experiments and Observations bearing on the 
Interpretation of Form and Coloration in Plants and Animals: C. F. M. 
Swynnerton. 
INSTITUTION OF MINING AND METALLURGY, at 8.—The Precipitating 
Action of Carbon in Contact with Auriferous Cyanide Solutions: W. R. 
Feldtmann.—Cyaniding of Gold-Silver Ores at Waihi Grand Junction : 
N. Carless.—The Effect of Mineralised Waters in Cyanide Plants: T. B. 
Stevens and W. S. bradley. 
FRIDAY, Aprit 16. 
Rovac InstiTuTION, at 3.—The Russian Idea: S. Graham. 
INSTITUTION OF MECHANICAL ENGINEERS, at 8.— President's address : 
Dr. W. Cawthorne Unwin. 
SATURDAY, Apriv 17. 
Roya. INsTiTUTION, at 3.—Modern Artillery: Lieut.-Col. A. G. Hadcock. 
MONDAY, Aprit 109. 
Vicrorta INsTITUTE, at 4.30.—The Zoroastrian Doctrine of a Future Life: 
Prof. J. Hope Moulton. 
TUESDAY, Arriv 20. 
RGNTGEN Society, at 8.15.—Late Radium and X-Ray Burns: Dr. N. S. 
Finzi.—A New Alpha Ray Effect : F. H. Glew. 
Kova. STatisticat Society, at 5.15.—The Progress of Friendly Societies 
end other Provident Institutions during the Ten Years 1904-1914: Sir 
Edward Brabrook. 
Wrrevess Society, at 8.—Methods of the Measurement of the Strength of 
Wireless Signals: Dr. E. W. Marchant. 
WEDNESDAY, Apru. 21. 
Rovat MeTeoroLoaicat Society, at 7.30.—A Study of the Moving Waves 
of Weather in South America: H, Helm Clayton.—The Correlation 
between Changes ia Barometric Height at Stations in the British Isles : 
E. H. Chapman. 
NO. 2372, VOL. 95] 


THURSDAY, Apri 22. 
Roya Society, at 4.30.—Psobable Papers: Weep Water Waves, Pro- 
gressive or Stationary, to the Third Order of Approximation: Lord 
Rayleigh.—A Chemically Active Modification of Nitrogen, produced by 
the Electric Discharge. VI.: Hon. R. J. Strutt.—The Difference 
between the Magnetic Diurnal Variations on Ordinary and Quiet Days at 
Kew Observatory: Dr. C. Chree.—The Effects of Different Gases on the 
Electron Emission from Glowing Solids: F. Horton.—Heats of Dilution 
of Concentrated Solutions: W. S. Tucker.—The Origin of the ‘‘ 4686" 
Series : T. k. Merton. 
Roya InstiruTion, at 3.—The System of the Stars: The Stellar System 
in Motion: Prof. A. S. Eddington. 
FRIDAY, APRIL 23. 
Roya InstiTuTION, atg-—Military Hygiene and the War: Major P. S. 
Lelean. 
INSTITUTION OF MECHANICAL ENGINEERS, at 8. f 
Puysicat. Society, at s5.—The Theories of Voigt and Everett Regarding 
the Origin of Combination Tones: Prof. W. B. Morton and Miss Mary 
Darragh. —~Experiments on Condensation Nuclei Produced in Gases by 
Ultra-Violet Light: Miss Maud Saltmarsh.—The Self-Induction of 
Solenoids of Appreciable Winding Depth: S. Butterworth. 
SATURDAY, Arrit 24. 
Roya InstITuTION, at 3.—Modern Artillery : Lieut.-Col, A. G. Hadcock- 

CONTENTS. 
Colour) Vision: 2) .°r. aes ee 
The Experimental Method in Medicine and Sur- 
PAGE 
169 
gery. By Stephen Paget. oj Moh ehaehe cn NotaaeTe hi 
Pure Mathematics: By/ Gi Big Mo mere ga 
Psychology.and Philosophy |. = 20502 ey.) ne) eee 
Our Bookshelf: ~ 7... 7 NS asta rere res ce 
Letters to the Editor:— 
The Thermionic Current.—Prof. A.S. Eve. . .. 174 
A Mistaken Butterfly.—Prof. E. E. Barnard . . . 174 
British Supply of Drugs and Fine Chemicals. By 
Prof. H. B. Baker, F.R.S. | . Later ded Sees 
Home Forestry and the War. (Z//ustrated.) .. . 176 
dhe Garnegie Trust) 2. pee Sg coeeue : 178 
Inexact Analogies in Biology. By Dr. F. A. Bather, 
11) at sre Seale ada ce ee LAS 
Prof. Otto N. Witt. By Sir T. E. Thorpe, C.B., 
1) Sh: ee, Sh Se Ee 2 TE 
Notest i... feo 2 2 OL een ere ee 
Our Astronomical Column :— 
Comet 1915@(Mellish) ... . Poy w ites.) 
The Chromospheric Spectrum without an Eclipse . . 185 
The Rotation of Nebulz . See ate Uo Lek 
The ‘Scientific American” and Astronomy. . . . 185 
Experimental Study of the Mechanism of Writing. 
(Zilustrated.) . . . «a7 DGGE: Ge Neo cere ae Ls 
Rlorajof-Aden! By Fi Coae meee oT] 
Ornithological Notes. ByR.L. ......... 188 
Mountain) Geology...) (apace seen enon eee 
Blood=Parasites and Fleas) 3)205) eee OD 
Changes of Relative Levels of Land and Sea, 
By J. W. J.—Preliminary Report on a Shaler 
Memorial Study of Coral Reefs. By Prof. W. M. 
Davis ai Rare ah be a . . 189 
Formulas for Glass Manufacture. ....... . 192 
University and Educational Intelligence .... . 193 
Societiesiand’ Academies) Si-);-pen-n (0-1 ee 
Books Received PEERS Aroma ool op. 2 
Diary of Societies .. gt Wei ly oe eo 


Editorial and Publishing Offices: 
MACMILLAN & CO., Ltp., 
ST. MARTIN’S STREET, LONDON, W.C. 

Advertisements and business letters to be addressed to the 
Publishers. 

Editorial Communications to the Editor. 
Telegraphic Address: Puusts, LONDON. 
Telephone Number: GERRARD 8830. 
