502 
NATURE 
[JULY I, 1915 

quire watching.—J. Deprat: The modifications in the 
structure of the Fusulinidz from the Dinantian to the 
end of the Permian.—Pereira de Sousa: The earth- 
quakes at Algarve (southern Portugal) from 1911 to 
1914. These appear to be of epirogenic origin.—B. 
Galitzine : The earthquake of February 18, 1911. This 
earthquake coincided with a great rock slide at Sarez, 
in the Pamir, which filled up the valley of Mourgab 
and transformed it into a lake. The author concludes 
that this rock fall was not the consequence, but the 
cause of, the seismic disturbance registered at so many 
stations. —J. Clarens: The estimation of urinary 
acidity.—H. Busquet : The mode of action of colloidal 
gold: the production of cardiac effects by particles of 
metal not in solution. From a study of the effects of 
the injection of colloidal gold into the dog and rabbit, 
it is concluded that the immediate effects on the heart 
cannot be attributed to gold in solution, but must be 
produced by the suspended colloidal particles.—H. 
Stassano: The sterilisation of microbial cultures or 
emulsions by heat in thin layers.—Em. Bourquelot, M. 
Bridel, and A. Aubry: Researches on the glucosidifica- 
tion of glycerol by B-glucosidose (emulsin). The pro- 
duct obtained by the biochemical synthesis contained 
two glucosides, differing in their rotatory power and 
resistance to the action of emulsine. 
BOOKS RECEIVED. 
Lessons and Experiments on Scientific Hygiene and 
Temperance for Elementary School Children. By H. 
Coomber. Pp. xx+163. (London: Macmillan and 
Co., Ltd.) 1s. net. 
Indian Mathematics. 
By G. R. Kaye. 
(Calcutta and Simla: 
J Pp. 7 
Thacker, 
Spink and Co.) 
Ww 
Numerical Examples in Physics. By H. S. Jones. 
Pp.- xii +332. (London: G. Bell and Sons, Ltd.) 
3s. 6d. 
Citrus Fruits. By JE Coity Pp. xxce 520. 
(New York : The Neate Company ; London : Mac- 
millan and Co., Ltd.) 8s. 6d. net. 
The Principles of ‘Rural Credits as 
Europe and as Suggested for 
Applied in 
America. By J: B. 
Morman. Pp. xviii+296. (New York: The Mac- 
millan Company; London: Macmillan and Co., Ltd.) 
5s. 6d. net. 
with Particular 
R. R. Gates. Pp. 
Lid5) tos: 
The Mutation Factor in Evolution, 
Reference to Génothera. By Dr. 
xiv+ 353. (London: Macmillan and Co., 
net. 
Plant-Life. By C. A. Hall. Pp. xi+38o. 
don: A. and C. Black, Ltd.) 20s. net. 
The Analysis of Dyestuffs and their Identification 
in Dyed and Coloured Materials, Lake-Pigments, 
Foodstuffs, etc. By Prof. A. G. Green, Pp. ix+144. 
(London: C. Griffin and Co., Ltd.) 8s. 6d. net. 
The Aeroplane. By A. Fage. Pp. viii+136. (Lon- 
don: C. Griffin and Co., Ltd.) 6s. net. 
Aero Engines. By G. A. Burls. Pp. x+ 106. 
(London : C. Griffin and Co., Ltd.) 8s. 6d. net. 
Laboratory Work for Coal- Mining Students. By 
(Lon- 
J. Sim and A. M. Wylie. Pp. viiit+136. (London : 
E. Arnold.) 2s. 6d. net. 
Meteorology of Australia. Commonwealth Bureau 
of Rainfall Observations 
including all Available Annual 
of Meteorology. Results 
made in Queensland, 
Rainfall Totals from 1040 Stations for all Years of 
Record up to 1913, together with Maps and Diagrams. 
Pp. 285. (Melbourne: A. J. Mullett.) tos. 6d. 
Staffordshire. By W. B. Smith. Bp. “xi-F 155. 
(Cambridge : At the University Press.) 1s. 6d. net. 
The Strength of Materials. By E. S. Andrews. 
Pp. x+604. (London: Chapman and Hall, Ltd.) 
tos. 6d. net. r 
NO. 2383. VOL. 95] 

| 
Climbing Plants. By W. Watson. Pp. x+132+ 
plates. (London and Edinburgh: T. ‘C. and E. C. 
Jack.) 2s. 6d. net. 
The Analysis of Non-Ferrous Alloys. By F. 
son and L. Aitchison. Pp. vii+230. 
mans and Co.) 7s. 6d. net. 
Bartholomew’s New War Map of Italy and the 
Balkan States. (Edinburgh: J. Bartholomew and Co.) 
Is. net. 
The Poison War. By A. A. Roberts. 
(London: W. Heinemann.) 5s. net. 
DIARY OF SOCIETIES. 
FRIDAY, Juty 2. 
Geotoaists’ AssocIATION, at 8.—A Provisional Hypothesis to Explain the 
Occurrence of the Various Types of Fossil Man: Prof. A. Keith, 
SATURDAY, Juty 3. 
ARISTOTELIAN Society, BritisH PsycHoLocicat Society, and the 
Minp AssociaATION, at 6.—Joint meeting. Mr. Bertrand Russell’s 
Theory of Judgment: Prof. G. F. Stout. 
MONDAY, Jvty 5. 
ARISTOTELIAN SocIETY, BritisH PsycHoLocicat Sociery,- and the 
Mrinpb AssociaTION, at 4.—Joint meeting. The Import of Propositions : 
Miss Constance Jones, Dr. Bernard Bosanquet, and Dr. F. C. S. Schiller. 
CONTENTS. 
Tbbot- 
(London : Long- 
Pp. 144. 


PAGE 
Physical, Chemical, and Engineering Constants. 
By Dr. J. A. Harker, F.R.S. da smuctaeate 475 
Elementary Zoology. By G. H. ick 476 
Economic Geography. By J.D. F.. 476 
Sewage Problems. By Percy Gaunt F 477 
The Production of New Varieties of Plants . 478 
Our Bookshelf oR he ames ~ 478 
Letters to the Editor:— 
A Canadian Memorial to Hugh Miller.—Sir Arch. 
Geikie, O.M., K.C.B., F.R.S. 479 
The ‘‘Green Fluorescence” of X- Ray Tubes. —Prof. 
Herbert Jackson 479 
The Magnetic Storm and Solar Disturbance of June 17, 
1915.—Dr. C. Chree, F.R.S. 480 
The Names of Physical Units, —Dr. Norman R, 
Campbell. . 480 
The Use of Cotton for the Production of Ex- 
plosives SABI 
Problems of Airship Design and Construction oe 
A Regional Survey (J///ustrat d.) . 483 
Prof. Barnard’s Astronomical Photographs. By Dr. 
William J. S. Lockyer . . Ss) tS 
Cerebro-Spinal Fever. By R. T. ‘H. 487 
Notes 488 
Our Astronomical Column :— 
The Origin of Comets . ; 493 
Companions to Mellish’s Comet .- 493 
‘the Aberration Constant and Latitude Variation’ 493 
The Henry Diaper Memorial. . 493 
The Report of the Cambridge Observatory 1914-15 493 
The Destruction of Flies . : 493 
Air Pollution. ByJ. B.C. . 494 
Radiations from Exploding Atoms, * By Sir Ernest 
Rutherford, F.R.S. 494 
University and Educational ‘Intelligence Bay 2 : 498 
Societies and Academies Rese cered Neuter 



Books Received 502 
Diary of Societies 502 
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. 
