210 
NATURE 
[APRIL 25, 1912 
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DIARY OF SOCIETIES. 
THURSDAY, Apri 25. 
Royat Society, at 4.30.—The Diffusion and Mobility of Ions ina Magnetic 
Field : Prof. J.S. Townsend, F.R.S.—On‘the Observed Variations in the 
‘Temperature Coefficients of a Precision Balance: J. J. Manley.—On the 
Torque produced by a Beam of Light in Oblique Refraction through a 
Glass Plate: Dr. Guy Barlow.—Contributions to the Study of Flicker. 
Ill: Dr. T. C. Porter. 
Roya InstiTuTION, at 3.—Synthetic Ammonia and Nitric Acid from the 
Atmosphere: Prof. A. W. Crossley, F.R.S. 
Roya Society oF Arts, at 4.30.—The Central Provinces: 
Miller, K.C.S.1. 
INSTITUTION OF ELECTRICAL ENGINEERS, at 8.—Third Kelvin Lecture: 
Prof. H. du Bois. 
Concrete InstiTUTE, at 8.—Discussion on reports presented by the Tests 
Standing Committee, entitled (1) The Testing of Concrete, Reinforced 
Concrete, and Materials Employed therein ; (2) The Testing of Reinforced 
Concrete Structures on Completion. 
FRIDAY, Aprit 26. 
Roya INstiTuTION, at 9.—Sir William’ Herschel : Sir George Darwin, 
K.C.B., F.R.S 
PHYSICAL Sioa at 5.—Aadjourned Discussion: The Coefficients of 
Expansion of Fus:d Silica and Mercury: H. Donaldson.—The Solution 
of Net-work Problems hy Determinants: R. Appleyard.—A Method of 
Measuring Small Inductances: S. Butterwerth., 
NO. 122107, VOL 89] 
Sir John O. 
| 
INSTITUTION OF CIVIL ENGINEERS, at 8.—The Principles and Practice of 
Accountancy in Relation to Engineering Design and Work: T. Frame 
‘Thomson. 
MONDAY, Aprit 20. 
Royat Society or Arts, at 8.—Heavy Oil Engines: 
Sankey. 
INSTITUTE OF ACTUARIES, at 5.—On the Superannuation and Pension 
Funds of certain Metropolitan Borough Councils, their Establishment, 
Administration, and Actuarial Investization: H. W. Manly and T. G. 
Ackland. With Tables of Progress of Typical Funds for Officers and 
Workmen and Examples: L. E. Ciinton. 
TUESDA}+, Aprtt. 30. 
Roya InstiTuTION, at 3.—Insect Distribution with Special Reference to 
the British Islands: F. Balfour Browne. 
WEDNESDAY, May 1. 
Royat InsTITUTION, at 5.—Annual Meeting. 
RoyaL Society or ArrTs, at 8.—Ancient Egyptian Ceramics: 
Burton. 
SociETY or PusLic ANALYsTS, at 8.—The Analysis of Lithopone: W. L. 
Austin and Dr. C. A. Keane.—1he Effect of Calcium on the Ammonium 
Molybdate Lead Assay: C. O. Bannister and W. McNamara.—The Con- 
stituents of Oil of Savin: J. Watson Agnew and R. Bb. Croad —The 
Detection of Heavy Petroleum in Paints and Vegetable Oils: W. B. 
Pollard. 
ENTOMOLoGICAL Society, at 8.—Ihe Colour-groups of the Hawaiian 
Wasps: Dr. R. C. L. Perkins. 
GEoLoGIcaL Society, at 8.—Insect Remains from the Midland and South- 
Eastern Coal-Measures: H. Bolton. —On the Geology of Mynydd Gader, 
Dolgelly, with an Account of the Petrology of the Area between Dolgelly 
and Cader Idris: P. Lake and Prof S. H. Reynolds. 
THURSDAY, May 2. 
Rova_ Society, at 4.30.—Prolable Papers: Petrifications of the Earliest 
European Angiosperms : Marie C. Stopes —The Distribution of Oxydases 
in Plants and their 7dZe in the Formation of Pigments: Dr. F. Keeble 
and Dr. E. F. Armstrong.—-The Manifestation of Active Resistance to the 
Growth of Implanted Cancer : Dr. B. R. G. Russell.—The Nature of the 
Immune Reaction to Transplanted Cancer in the Rat: Dr. W. H. 
Woglam.—On the Instability of a Cortical Point: T. G. Brown and 
Prof. C. S. Sherrington, F.R.S —The Measurement of Z7yfpanosoma 
rhodestense: Dr. J. W. W. Stephens and Dr. HB. Fantham. 
Royat InstiTuTION, at 3. Explorations in the Canadian Rocky Moun- 
tains: Prof. J. Norman Collie, F.R.S. 
Linnean Society, at 8.—On the Structure of the Paleozoic seed Lageno- 
stoma ovoides, Will: Miss T. L. Prankerd.—Additions to the Flora of 
Western and North-Western Australia: Dr. Karl Domin.—Freshwater 
Rhizopoda from the States of New York, New Jersey, and Georgia, 
U S.A. ; with a Supplement on the Collection from the Seychelles: G. H. 
Wailes.—Ligidiwn hypnorum a Woodlouse new to Britain: W. M. 
Webb.—New Light on the Linnean Herbarium: The General Secretary. 
INSTITUTION OF ELECTRICAL ENGINEERS, at 8.—Adyjourned Discussion > 
The Causes Preventing the More General Use of Electricity for Domestic 
Purposes. 
Captain H. R. 
William 
FRIDAY, May 3. 
Royat InstTiTuTION, at 9.—The Use of Pedigrees : 
F.R.S. 
LNSTITUTION OF MECHANICAL ENGINEERS, at 8.—Reswmed discussion: 
Tenth Report to the Alloys Research Committee: on the Alloys of 
Aluminium and Zinc : Prof. J. O. Arnold. 
W. C. D. Whetham, 
PAGE 
CONTENTS. 
In Nature’s Byways . ote 185 
Soil Structure and Plant Growth. ey Dr. E. I 
Russell... an 186 
The Advance of Photography. By oe a aed 187 
The Grammarof Science... . ae 188 
A Biological Dictionary . 3 RF dee SEL ce gin lel. 
Our Bookshelf , . os) GER eee se. eee 
Letters to the Editor :— 
Insect Parasites on Trees, —Right Hon, Sir Herbert 
Maxwell, Bart., F.R.S. . . 19r 
The Propagation of Long Electric Waves during the 
Solar Eclipse (l¥7th Diagram.)—Dr.W.H.Eccles 191 
Glazed Frost.—Andrew H. Palmer . . 192 
Animal Intelligence.—_M. N. WW. . .. .. .. 192 
The Eclipse of the Sun on ee wz ai? ; 192 
Sardines . . SAINT CS 194 
Prof. A. Lawrence Rotch. By E.G. Puan 195 
INotesiy. - Oo. o9 8 oa RG. ol 195 
Our Astronomical Column :-— 
Cometary Statistics . . . ie, 2s OO) 
The Best Value of the Solar Constant Spo oS) 
Observations of Saturn and its Rings . 199 
The Cafion Diablo Crater . So hee cas | arta) 
Nova Geminorum No. 2. (//lustrated.) By F. E. ; 
Baxendall ; William E. Rolston. Mec) 2 
The Loss of the ‘ Titanic” 201 
Reports upon Meteorological Observations pia, 215¥3 
The Origin of Radium. (lth Diagrams.) By 
Rrederick soddy, F:R°S) -eeeemeen enc. ies 203 
The Crocker Land Expedition . A Ge 0 206 
University and Educational Intelligence Saran © 206 
Societiesand Academies ...... 207 
Books Received 209 
Diary of Societies . 210 
