446 
NATURE 
[JUNE 17, I915 

series isolated by Fowler are strictly analogous to 
principal series in line-spectra; (3) the generalised 
Rydberg formula, in which. the wave number is a 
function of m+vy, gives the most suitable representa- 
tion of these series as well as of line-series.—C. Dobell 
and A. P. Jameson: The chromosome cycle in Coccidia 
and Gregarines. The authors have investigated the 
chromosomes of a coccidian (Aggregata eberthi) and a 
gregarine (Diplocystis schneideri). They have found 
that the chromosomes are present in the haploid (‘‘re- 
duced’’) number—six in Aggregata, three in Diplo- 
cystis—at every nuclear division in the life-history 
except that of the zygote nucleus. This nucleus con- 
tains the diploid number of chromosomes—twelve in 
Aggregata, six in Diplocystis—and its division is a 
reduction division which halves the chromosome num- 
ber. Reduction thus occurs in these organisms imme- 
diately after fertilisation, and not during gameto- 
genesis. 
Mathematical Society, June 10.—Sir Joseph Larmor, 
president, in the chair.—Prof. W. Burnside: Periodic 
irrotational waves at the surface of deep water.—Prof. 
M. Kuniyeda: A theorem on series of orthogonal 
functions.—G. R. Goldsbrough: The effect on the 
tides of the variation in the depth of the sea.—Prof. D. 
Buchanan ; Oscillations near an isosceles triangle solu- 
tion of the problem of three bodies, as the finite 
masses become unéqual. 

BOOKS RECEIVED. 
The General Theory of Dirichlet’s Series. By 
G. H. Hardy and Dr. M. Riesz. Pp. 78. (Cam- 
bridge : At the University Press.). 3s. 6d. net. 
The Soul of the War. By P. Gibbs. Pp. 362. 
(London: W. Heinemann.) tos. 6d. net. 
Elementary Experimental. Statics. By JI. B. Hart. 
Pp. vii+2o00. (London: J. M. Dent and Sons, Ltd.) 
2s. 6d. 
The People of India. By Sir H. Risley. Second 
edition. Edited by W. Crooke. Pp. xxxii+472+ 
plates xxxv. (Calcutta: Thacker, Spink and Co.; 
London: W. Thacker and Co.) 21s. net. 
Making the Most of Life. By Prof. M. V. O’Shea 
and J. H. Kellogg. Pp. ix+298.. (New York: The 
Macmillan Company; London: Macmillan and Co., 
Bid?) gseata: 
The Statesman’s Year-Book, 1915. Edited by Dr. 
J. Scott Keltie, assisted by Dr. M. Epstein. Pp. 
Ixxxiv+1536. (London: Macmillan and Co., Ltd.) 
ros. 6d. net. 
Petroleum Technologist’s Pocket-Book. By Sir B. 
Redwood and A. W. Eastlake. Pp. xxiv+454. (Lon- 
don: C. Griffin and Co., Ltd.) 8s. 6d. net. 
Refuse Disposal. By Prof. E. R. Matthews. Pp. 
xili+ 160. 
net. 
The Tokyo Imperial University Calendar, 1913-14. 
Pp. vi+349. (Tokyo: Maruya and Co.) 
(London: C. Griffin and Co., Ltd.) 6s. 
LINNEAN SocIETY, at 5.—Colonel Montagu, Naturalist : Bruce Cummings. 
—The Fibre of Calotrosis procera, and the Cultivation of the Plant from 
an Economic Point of View : Dr. George Henderson.—The Structure of 
the Rhiz pod Test : John Hopkinson.—Medusz from the Indian Ocean, 
collected in 1905: E. ['. Browne.—Report on the Hexactinellid Sponges 
(Triaxonida) collected by H.M.S. Sea/ar& in the Indian Ocean : Prof. A.. 
Dendy.—The Cephalopoda obtained by the Percy Sladen Trust Expedition 
to the Indian Ocean in 1905: J. C. Robson. 
MONDAY, Jvne 21. 
Victoria InstiTuTE, at 4.30.—Annual Address: The Unity of Genesis. 
Prof. H. Edouard Naville. 
WEDNESDAY, JUNE 23. 
Gerotocicat Society, at 8.—A New Eurypterid from the Belgian Coal 
Measures: Prof. Xavier Stainier.—A Fossiliferous Limestone from the 
North Sea: R. B. Newton.—The Origin of the Tin-ore Deposits of Kinta 
District, Perak (Federated Malay States): W. R. Jones. 
FRIDAY, JUNE 25. 
Puysicat Society, at 5.—A Theory of the Electrical Resistance of Metals * 
Sir J. J. Thomson.—An Unbroken Alternating Current for Cable Tele 
graphy: Lt.-Col. Squier. 

CONTENTS. 
The Mobilisation of Science at's . 
Modern Electrical Theory. By N. B. ...... 
Horticulture and Botany. = ijn nme 
Manuals of Physics . WAR Gb Heo 95 
Evolutionary Medicine. By R.T.H........ 
Our Bookshelf MBAS 0 oh ce 5 Go 
Letters to the Editor:— 
Surface Tension and Ferment Action.—Dr. 
Armstrong; Prof. H. E. Armstrong, 
Training for Scientific Research.—Dr. 
Patterson Bc : Onde como cue 
Galileo and the Principle of Similitude.—Prof. 
DiArcy, W. Ehompson; (\CoBa eee 
The Names of Physical Units.—Dr, Ch. Ed. 
Guillaume ; Dr. J. A. Harker, F.R.S. .. . - 
University Appointments in War Time.—Prof. Percy 
K7Eerankland, F>R'S. 3) eee 
Volunteers for Scientific Work.—Edward Heron- 
Allen : 
Scientific Methods in 
Hampshire Field Archzology. 
Lieut. W. E. Rolston Pi C5 eo Ohi is 
Cotton for German Ammunition. By Sir William 
Ramsay. CB, °h. RS.) ieee renee 
Mirek He) Neville. F.R.S:. Giese 5.8 
INOtesiar a MMPI OE OO 
Our Astronomical Column :— 
Behaviour of Spectrum Lines of the Same Series . . 
The Fisher, Polk County, Minnesota, Meteorite. . 
The Nantucket Maria Mitchell Association . eae 
Recent Bulletins of the Astronomical Society of France 
Iron, Carbon, and Phosphorus. By Prof. H. C. H. 
Carpenter. PP Pua 2 
The Seismological Society of America. By Dr. C. 
Davison obhe MPM oo 8 us sh isc 
IndianyiGeodesy:, By H:-Gi Lae 
The Fly Problem . : . a) ea eee ones ‘ 
Jamaica as a Centre for Botanical Research in the 
MropicssyeBy Mi D..\.: 2, | 0 eee anne 
The American Philosophical Society ....... 
University and Educational Intelligence ..... 
societiesrand’Academies —<)-sa.eieat an non 
Books Received PE re Ge SS Sea. cS 
Diary of Societies .. ee ie hh oe Bo 
1B. 1 
F.R.S. 
#86) Sh 
Industry. “By w. P. Dreaper 
(Zilustrated,) By 


DIARY OF SOCIETIES. 
THURSDAY, June 17. 
Rovar Society, at 4.30.—Analyses of Agricu’tural Yield. II. 
Sowing-date Experiment with Egyptian Cotton, 1913: W. L. Balls 
and F. S. Holton.—Soil Protozoa and Soil Bacteria: E. J. Russell.— 
The Enhanced Series of Lines in Spectra of the Alkaline Farths: Prof. 
W. M. Hicks.—Certain Linear Differential Equations of Astronomical 
Interest: Prof. H. F. Baker.—The Partial Correlation-Ratio: Prof. 
Kar] Pearson.—T he Effect of Temperature on the Hissing of Water when 
flowing through a Constricted Tube: S. Skinner and F. Entwistle.— 
Ionisation Potentials of Mercury Cadmium and Zinc and the Single and 
Many-lined Spectra of these Elements: J. C. McLennan and J. P. 
Henderson.—A Diagram to Facilitate the Study of External Ballistics : 
Prof. W. E. Dalby.—The Monoclinic Sulphates containing Ammonium. 
Completion of the Double Sulphate Series: Dr. A. E. H. Tutton.—And 
other papers. 
NO. 2381, VOL. 95| 

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