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DIARY OF SOCIETIES. 
THURSDAY, June 20. 
Rovat Society, at 4.30.—An Investigation into the Life-history of 
Cladothrix dichotoma (Cohn): Dr. D. Ellis.— The Relation of 
Secretory and Capillary Pressure. JI. The Salivary Secretion: 
Leonard Hill and M. Flack.—The Origin and Destiny of Cholesterol in 
the Animal Organism. Part IX. On the Cholesterol Content of the 
Tissues other than Liver of Rabhits under Various Diets and during 
Inanition : G. W. Ellis and J. A. Gardner.—A Note on the Protozoa from 
Sick Soils, with some Account of the Life-cycle of a Flagellate Monad : 
C. H. Martin.—Further Observations on the Variability of Sireptococci 
in Relation to Certain*Fermentation ‘Vests, together with some considera- 
tions bearing upon its possible meaning: E. W. A. Walker.—The 
Chemical Action on Glucose of a Variety of B. coli communis (Escherich) 
obtained by cultivation in presence of a Chloroacetate (Preliminary 
notice): A. Harden and W. J. Penfold.—The Action of Enzymes on 
Hexosephosphate: V. 1. Harding.—The Oxydases of Cytisus Adame: 
Prof. F. W. Keeble and Dr. E. F. Armstrong. 
Linnean Society, at §.—Les Euorthopteres des Seychelles: Seiior 
Ignacio Bolivar.—Diptera: Loncheide, &c., of the Seychelles: C. G. 
Lamb.—The Coleoptera of the Seychelles: Hugh Scott.—Terrestrial 
Isopoda, particularly considered in relation to the Distribution of the 
Southern Indo-Pacific Species ; the late Dr. G. Budde-Lund.—Selection of 
Coloured Drawings of Alpine Flowers by Mr. George Flemwell: H. 
Stuart Thompson.—On some Indian Jurassic Gymnosperms: Miss Nellie 
Bancroft.—The Ferns of the Seychelles and Aldabra: Carl Christensen. 
MONDAY, June 24. 
Royat GrocrapHicat Society, at 8.30.—A Year's Exploration in the 
Sonora Desert, Mexico: Dr. Carl Lumholtz. 
WEDNESDAY, June 26. 
Cuemicay Society, at §.30.—Cannizzaro Memorial Lecture : Sir William 
Tilden. 
THURSDAY, June 27. 
Royar Society, at 4.30.—Probable Papers: Electrical Vibrations on a 
Thin Anchor Ring: Lord Rayleigh, O.M.—The Molecular Statistics of 
some Chemical Actions: Hon. R. J. Strutt.—Morphological Studies of 
Benzene Derivatives, III. Para-Dibromo-benzene-sulphonates (isomor- 
phous) of the ‘‘ Rare Earth” Elements—a Means of Determining the 
Directions of Valency in Tervalent Elements: Prof. H. FE. Armstrong 
and E. H. Rodd.—Optical Rotatory. Dispersion. Part I. The Natural 
and Magnetic Rotatory Dispersion in Quartz of Light in the Visible 
Region of the Specrrum: Dr. T. M. Lowry.—On the Apparent Change 
in Mass during Chemical Reaction: J. J. Manley.—On the Diurna 
Variations cf the Electric Waves occurring in Nature, and onthe Pro 
NO. 2225, VOL. 89] 
NATURE 
[June 20, 1912 
N 
pagation of Electric Waves round the Bend of the Earth: Dr..W. H- 
Eccles.—Repert on the Total Solar Eclipse of April 28, 1911: Rey. A. 
L. Cortie, S$. J.—And other papers. 
FRIDAY, June 28. 
Puysicat. Society, at 5.—Hysteresis Loss as affected by Previous Mag- 
netic History: Prof. E. Wilson. B. C. Clayton, and A. E. Power.—The 
Efficiency of Generation of High-frequency Oscillations by means of an 
Induction Coil and Ordinary Spark Gap: Prof. G. W. O. Howe and J. 
D. Peattie.—Dielectric Hysteresis at Low Frequencies: Prof. W. M- 
‘Thornton. —The Resistance to the Flow of Water along a Capillary Soda 
Glass Tube at Low Rates of Shear: Dr. A: Griffiths and Miss C. H. 
Knowlés.—Self-Demagnetisation of Steel: S. W. J. Smith and J. Guild. 
FORTHCOMING CONGRESSES. 
JUNE 19-26. —Optical Convention. London, President: Prof. Silvanus P. 
Thompson. Secretary: J. W. Gordon, 113 Broadhurst Gardens, Hamp- 
stead. 
Jury 1-6.—South African Association for the Advancement of Science. 
Port Elizabeth. President: Dr. A. Theiler, C.M.G. 
Jury 2-5.—Congress of the Universities of the Empire, 
tary: Dr. Alex Hill, University of London. 2 
Jury 15-19.—Celebration of the 25oth anniversary of the Royal Society. 
London. 
Jury 24-30.—First International Eugenics Congress. London. Presi- 
dent: Major Leonard Darwin. Secretary: Eugenics Education Society, 
6 York Buildings, Adelphi. f : 
JuLy 25-28.—Congress of the Royal Institute of Public Health. 
Address : Russell Square, W.C. c ; 
Juty 29-AuGcustT 3.—Royal Sanitary Institute. 
Buckingham Palace Road, S.W. 4 
Aucust 5-10.—International Congress of Entomology. Oxford. Presi- 
dent: Prof. E. B. Poulton. General Secretary : Dr. Malcolm Burr, c/o The 
Entomological Society of London, 11 Chandos Street, W. 5 
AuGusT 22-28.—(i) International Congress of Mathematicians, an¢ (i) 
International Commission on Mathematical ‘Teaching. President : Prof. 
Klein. Treasurer: Sir J. Larmor, F.R.S., St. John’s College, Cambridge. 
SEPTEMBER (first week) —International Congress of Anthropology and 
Prehistoric Archzology. Geneva. E 
SEPTEMBER 4-11.—British Association. Dundee. President: Prof. E.A. 
Schafer, F.R.S. Assistant Secretary : O. J. R. Howarth, Burlington House, 
London, W. ; : 
SEPTEMBER 4-13.—International Congress of Applied Chemistry. Wash- 
ington, D.C. President: Dr. W. H. Nichols. Secretary : Dr. B. G. Hesse, 
25 Broad Street, New York City, U.S.A. 
SepremMBER 8-11.—Société Helvétique des Sciences Naturelles. Altdorf. 
President: Dr. P. B. Huber. Secretaries: Prof. J. Briilisauer (German) 
and M. P. Morand Meyer (French), Altdorf. 
SEPTEMBER 23-28.—International Congress on Hygiene and Demography. 
Washington. President: Dr. H. P. Walcott. Secretary-General: Dr. J. S. 
Fulton, Army Medical Museum, Washington, D.C. : 
London. Secre- 
Berlin. 
York, Address : go 
CONTENTS. 
PAGE 
Introductions to Biology) 92 semen] ce ae = 995: 
Modern Mathematics for Teachers. By G. B. M. 395 
Impressions of a Guiana Forest ....... 396 
Body and Soul 396 
Our Bookshelf «wo! agosbey OSS MRCR a lod ate ee Sic Reem 
Letters to the Editor :— 
The Effect of Grass on Plants. —Spencer Pickering, 
ERS. . Ay oe 2 5 . ; 5 399° 
The Local Races of Burchell’s Zebra.—R. I. Pocock, 
RES) a > 2 Ok, 1 af lens ee 
Boulder Clay in Essex.—Rev. Dr. A. Irving 399 
Campaign against Rats.—Walter Hutton. . . . . 399 
The Progress of Radiotelegraphy. By Dr. J. 
Erskine-Murray . .°. \S0meenenr <) =) acs nie 
Fabre and the Insect World. © (J//ustvated.) . . . . 401 
Production of Synthetic Rubbewa. © =. 2). ameeaae 
The Transmission of Sleeping Sickness 402 
Notes . ‘ove Gp 403 
Our Astronomical Column :— 
Constitution of the Milky Way . 407 
Mibensolan Eclipse .of Atprili7aeeeemenicnns) lose 407 
Magnitudes of Nova Geminorum No.2 .. . . 408 
Designations of Newly-discovered Variable Stars 408 
Some Recent Workin Paleontology. ByG. A.J.C. 408 
The Isle of Wight Bee Disease 410 
The Kinematograph in Science Teaching 410 
Icebergs and their Location in Navigation. (J///us- 
trated.) By Prof. Howard T. Barnes, F.R.S.... qr 
University and Educational Intelligence .... 414 
Societiessand Academies | -jeucmuedse. ©. |.) en emeyulS 
Books#Received.".. . .- sy SeNNeonacets) 2 
Diaryzomsacreties . . . . j seems 3 We aE cs . 418 
Forthcoming Congresses 418 
