224 


NATURE 
[APRIL 22, 1915 

method for estimating the amount of peroxydase in 
the tomato, and this method was applied to 
determining the proportions of peroxydase dur- 
ing’ the different stages of the ripening of 
the fruit. From the results obtained, it is con- 
cluded that the tissue of the tomato contains an 
enzyme which paralyses the oxidising action of the 
peroxydase. This is provisionally termed anti- 
peroxydase, and it is much more sensitive than the 
peroxydase to the influence of antiseptics. Even 
toluene destroys it fairly rapidly. The relations be- 
tween these two enzymes during the ripening of the 
fruit is discussed.—A. Jungelson: Chemical intoxica- 
tion and mutation of maize. Studies in the variations 
produced by treating the seed with a solution of 
copper sulphate.—H. Vincent and M. Gaillard: The 
purification of drinking water with calcium hypo- 
chlorite. Compressed tabloids of o-015 gram calcium 
hypochlorite with o-o8 gram salt are used. These 
contain 3-5 mgr. of active. chlorine, and one is capable 
of sterilising a litre of water in about twenty minutes. 
There is no appreciable taste. Bacteriological experi- 
ments are given showing the removal of pathogenic 
bacteria.—J. Vallot: An installation permitting the 
application of intensive heliotherapy, in winter, to 
wounded and military convalescents.—_MM. Hirtz and 
Gallot: A new radioscopic method for the determina- 
tion of the depth of a foreign body in the organism. 

BOOKS RECEIVED. 
Year Book of the Royal Society of London. 
250. (London: Harrison and Sons.) 5s. 
Imperial University of Tokyo. Calendar 2573-2574. 
(Tokyo: Z. P. Maruya and Co.) 
Royal Societies Club. Founded a.p. 1894. Founda- 
tion and Objects. Rules and By-Laws. List of 
Members. Pp. 354. (London.) . 
Practical Irrigation and Pumping. By B. P. Flem- 
Pp. 
ing. Pp. xvit+226. (New York: J. Wiley and Sons, 
Inc.; London: Chapman and Hall, Ltd.) 8s. 6d. 
net. 
The Design of Steam Boilers and Pressure Vessels. 
By Prof. G. B. Haven and G. W. Swett. Pp. vii+ 
416. (New York: J. Wiley and Sons, Inc.; London : 
Chapman and Hall, Ltd.) 12s. 6d. net. 
Electrical Engineering. By. Drak) (CoaBaullie: 
Vol. i., Introductory. Pp. viit+236. (Cambridge: At 
the re IBLessy) 5 Ss met. 

DIARY OF SOCIETIES. 
THURSDAY, Aprit 22. 
Roya Soctery, at 4.30.—Deep Water Waves, Progressive 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 
Se lowine Solids: F. Horton.—Heats of Dilution of Concentrated Solutions : 
W.S. Tucker.—The Origin of the ‘ 4686” Series: T. K. Merton. 
Rovat INsTITUTION, at 3.— The System of the Stars: The Stellar System 
in Motion : Prof. 4. Ss. Eddington. 
FRIDAY, Apri 23. 
Roya InstTiTUTION, atg.—Military Hygiene and the War: 
Lelean. 
INSTITUTION OF MECHANICAL ENGINEERS, at 8. 
Puysicat. Society, at 5.—The Theories of Voigt and Everett Regarding 
the Origin of Combination Tones: Prof. W. B. Morton and Miss. Mary 
Darravh. —Experiments on Condensation Nuclei Produced in Gases by 
Ultra-Violet Light: Miss Maud Saltmarsh.—The Seli-Induction of 
Solenoids of Appreciable Winding Depth: S. Butterworth. 
SATURDAY, Arru 24. 
Rovat InstiTuUTION, at 3.—Modern Artillery : Lieut.-Col, A. G. Hadcock, 
MONDAY, Aprrit 26. 
Royat GEoGRAPHICAL Society, at 8.30.—Geography of the War Theatre 
in the Near East: D. G. Hogarth. 
Royav Society oF Arts, at 8,—Foodstuffs: Dr. D. Sommerville. 
INSTITUTE OF AcTUARIES, at 5.—The New Naienat Life Tables: G. King. | 
NO. VOL. 95] 
Major P. S. 

9252 
So D9 
TUESDAY, Apvrit 27. 
pyrene ee hp at 3.—The War on Belgian Architecture : Banister 
etcher 
ZooLoGicaL Society, at 5.30.—White Collar Mendelising in Hybrid 
Pheasants: Mrs. Rose Haig Thomas.—Two New ‘l'ree-Frogs from 
Sierra Leone, recently Living in the Society's Gardens : E. G. Boulenger, 
—The Foraminifera of the Kerimba Archipelago(Portuguese East Africa). 
Part II. : E. Heron-Allen and A. Earland. 
InLuminatinG ENGINEERING SocIETY at 8.—Visibility : 
Aspects: C. C, Paterson and B. P. Dudding. 
INsTITUTION OF CiviL ENGINEERS, at 8.—Annual General Meeting. 
WEDNESDAY, Apru, 28. 
Royat Society OF Arts, at 8.—The Utilisation of Solar Energy: A. S. E. 
Ackermann. 
INSTITUTION OF ELECTRICAL ENGINEERS, at 7.45 (Students’ Section).— 
Annual General Meeting. 
GEoLoGIcaL Society, at 8.—A Composite Gneiss near Barna (County of 
Galway): Prof. Grenville A. J. Cole-—Further Work on the Igneous 
Rocks associated with the Carboniferous Limestone of the Bristol District = 
Prof. S. H. Reynolds. 
THURSDAY. Apri 20. 
Roya Society, at 4.30.—Probable Parers: The Transmission of Infra- 
red Rays by the Media of the Eye, the Transmission of Radiant Energy 
by Crookes’s and other Glasses, and the Radiation from various Light 
Sources: H. Hartridge and A. V. Hill.—Surface Tension and Ferment 
Action: E. Beard and W, Cramer.—Surface Tension as a Factor con- 
trolling all Metabolism: W. Cramer. 
RovaL INSTITUTION, at 3.—Advances in General Physics: Prof. A. W. 
orter. 
INSTITUTION OF ELECTRICAL ENGINEERS, at 8.—The Bombay Hydro- 
Electric Scheme: A. Dickinson. 
FRIDAY, AprRit 30. 
Roya InstiTuTIoNn, at 9.—Emulsions and Emulsifications: 
Donnan. 
INSTITUTION OF PETROLEUM TECHNOLOGISTS, at 8.—Oil Well Engineer- 
ing: W. Calder. 
its Practical 
Prof. F. G. 
SATURDAY, May t. $ 
Roya. Institution, at 3.—Photo-Electricity : Prof. J. A. Fleming. 
CONTENTS. 
The Biological Problem of Sex. . . ac 
X-Rays and Crystals. By Dr. A. Ba H. ‘Tutton, 
Fakes ish el Pcl ei oye eae eee 
Sir Hiram Maxim. By J. P. 36 6 
Appearance and Reality. By A. E. Crawley Seca 
Our Bookshelf ‘ ae acoso! dun 
Letters to the Editor:— 
The Principle of Similitude.—Prof. D’Arcy W. 
Thompson, C.B.; Lord Rayleigh, Os 
OSES ap 5 
The Age of the Earth, _Dr. F. A. Lindemann . ; 
Harmonic Analysis.—Dr. Alexander Russell. . . 
A Mistaken Butterfly.—Dr. Henry O. Forbes. . 
The ‘‘Green Ray” at Sunset.—T. B, Blaithwayt 
Healthy Atmospheres. (///ustrated.) Prof, Leonard 
Hill, F.R.S. . Bic Re arena 
Aids to Nature- Study. (Jilustrated.) . : 
Three Naturalist-Travellers. Cera ByJ. W.G. 
Prof, W. Grylls Adams, F.R.S..... ae eit 
INGresa acu a Sree Me (Oo OF OO, 10, 5 
Our Astronomical. Column :— 
Comet Notes .. SF opments og rice o 
The Rotation of the Solar Corona . he a8 
The Annual of the Bureau des Longitudes, 1915, Ses 
Chinese Records of Eclipses 
Teaching of Beeiserne in Evening “Technical 
Schools .. Sey topiteate 
English Mathematics. ‘By G. B. M. dilonHageo.s 
Public Health } 
The Carnegie Institution of ‘Washington “and 
Scientific Research. . . Pele. o 
University and Educational Intelligence Eee Suro) 10 
SocietiesrandeAcad mies) se. mi. ml wenn itt 
Books Received Suc ce Res oo cd 
Diary of Societies . . Bis 2.0 (CarrOMN ONG..Orc 

PAGE 
197 


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