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DIARY OF SOCIETIES. 
THURSDAY, Apru. 18. 
Royav InstiTuTION, at 3.—Synthetic Ammonia and Nitric Acid from the 
Atmosphere : Prof. A. W. Crossley, F.R.S. 
LINNEAN Society, at §8.—Sotrychioxylon paradoxum, a Palzozoic fern 
with secondary wood: Dr. D. H. Scott, F.R.S.—On Psyemophyllium 
majyus, sp. nova, from the Lower Carboniferous rocks of Newfoundland, 
together with a revision of the genus, and remarks on its affinities: 
Dr. E. A. Newell Arber.—The Alpine Flora of the Canadian Rocky 
Mountains : Mrs. Henshaw. 
INsTITUTION OF ELECTRICAL ENGINEERS, at 8.—Adyourned Discussion : 
The Causes Preventing the More General Use of Electricity for Domestic 
Purposes. 
INSTITUTION OF MINING AND METALLURGY, at 8.—Notes on the Valuation 
of Oresand Minerals and on Metallurgical Calculations: G. T. Holloway. 
—The Domes of Nova Scotia: T. A. Rickard.—Gels in Relation to Ore 
Deposition : E, Hatschek and A. L. Simon.—Recent Practice in Diamond 
Drilling and Borehole Surveying : J. I. Hoffmann. 
FRIDAY, Aprit 109. 
Roya Institution, at 9.—Electricity Supply: 
Future: A. A. Campbell Swinton. 
InsTITUTION OF MEcHANICAL ENGINEERS, at 8.—Tenth Report to the 
Alloys Research Comsnittee on the Alloys of Aluminium and Zinc: 
Dr. W. Rosenhain and S. L. Archbutt. 
InstTiTuTION oF CiviL ENGINEERS, at 9.— James Forrest” Lecture: 
Aerial Flight : A. Mallock, F.R.S. 
MONDAY, Aprit 22. 
Roya GEOGRAPHICAL SOCIETY, at 8,30. 
TUESDAY, Apru. 23. 
Farapay Society, at 8.—Discussion on Magnetic Properties of Alloys, 
preceded by the following Papers: On the Magnetic Properties of Iron- 
carbon and Tron-silicon Alloys: Dr E. Gumlich.—The Dependence of 
Magnetisation on Composition in Chemical Compounds: Prof E., 
Wedekind.—The Magnetic Properties of a Variety of Special Steels at 
Low Temperatures, and The Heusler Alloys: Dr. Alexander D. Ross and 
Dr. J. G. Gray.—(1) The Magnetic Properties of Nickel and Manganese 
Steels with Reference to their Metallographical Composition ; (2) The 
Magnetic Properties of the Compounds of Manganese with Phosphorous, 
Arsenic, Antimony, and Bismuth: Dr. S. Hilpert and Dr. E. Colver- 
Glauert.—The Nature of the Heusler Alloys: The Physical Aspect: Dr. 
E. Take.—The Chemical Aspect: Dr. F. Heusler.—Variation of Ferro- 
magnetic Properties of the Heusler Alloys with Composition and Heat 
Treatment: Prof. A. A. Knowlton.—The Relations between the Mech- 
anical Hardness and the Retentiviy and Permeability of Ferro-Alloys : 
NO. 2216, VOL. 89] 
Past, Present, and 
und Hilfs-. 
NATURE 
[ApriL. 18, 1912 
Prof. C. F. Burgess and J. Aston.—The Magnetic Properties of ‘the Iron- 
nickel, Iron-cobalt, and Nickel-cobalt Alloys: Prof. Pierre Weiss. 
Roya SratisTIcaL Society, at 5.—On the Methods of Measuring Asso- 
ciation between Two Attributes : G. Udny Yule. 
Rovat ANTHROPOLOGICAL INSTITUTE, at 8.15.—Pre-Boulder Clay Man: 
Mr. Moir and Prof. A. Keith. 
ZooLocicat Sociery, at 8.20—A First Account of the Courtship of the 
Redshank (Yotanus calidris): Julian S. Huxley. — Amphipoda from 
Bremerhaven: Mrs. E. W. Sexton.—Descriptions of New Fishes of the 
Family Loricariidz in the British Museum Collection: C. Tate Regan.— 
The Circulatory System of the Common Grass Snake (7%epidonotus 
natrix): C. H. O'Donoghue. 
Instirution oF CiviL ENGINEERS, at 8.— Further Discussion: The 
Remodelling and Equipment of Madras Harbour : Hon. Sir Francis ey 
Spring, K.C.I.E.—The Alteration in the Form of Madras Harbour : 
H. H. G. Mitchell. 
WEDNESDAY, Aprrit 24. 
Roya Society orf Arts, at 8.—Technical Education in Ireland: George 
Fletcher. 
THURSDAY, Apriu 25. ' 
Roya. Society, at 4.30.—Probable Papers : Vhe Diffusion and Mobility of 
Ions ina Magnetic Field : Prof. J.S. Townsend, F.R.S-—On the Observed 
Variations in the ‘'emperature Coefficients of a Precision Balance: J. J. 
Manley.—On the Yorque produced by a Beam of Light jin Oblique 
Refraction through a Glass Plate: Dr. Guy Barlow.—Contributions to the 
Study of Flicker. IIL: Dr. T. C. Porter. 
Royav INsTITUTION, at 3.—Synthetic Ammonia and Nitric Acid from the 
Atmosphere: Prof. A. W. Crossley, F.R.S. 
RoyaL Society oF ARTS, at 4.30.—The Central Provinces: Sir John O. 
Miller, K.C.S.1. . ‘ ae 
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. 
PuysicaL Society, at 5.—Adjourned Discussion> The Coefficients of 
Expansion of Fused Silica and Mercury: H. Donaldson.—The Solution 
of Net-work Problems by Determinants: R. Appleyard.—A Method of 
Measuring Small Inductances: S. Butterwerth. : 
INsTITUTION OF CiviL ENGINEERS, at 8.—The Principles and Practice of 
Accountancy in Relation to Engineering Design and Work: T. Frame 
‘Thomson. . 
CONTENTS. PAGE 
Progress of the Steam Turbine. By W.H. W. . . 1590 
Inferior: Races. . By, A EgCrawley 4. . 7 >. See eeeeton 
Appliedi@hemistry. By S-) eyes.) =) | letenreenelos 
Agriculture in the School and Afterwards. By Dr. 
Si Russell .  . .9. sae ep: 2 (ston 
Algebraic Numbers. By GJ By Mee 2) -).. . 2 eeemtod 
A History of European Cultivated Plants and 
Domestic Animals. ByJ.H.T.W..... . 164 
GeneraliScrence .) . : Eps eieesee cnt...) - pe em 
Our Bookshelf MR 0G) os woe TBS py CIS: 
Letters to the Editor :— 
The Principle of Reflection in Spectroscopes.—Lord 
Rayleigh, O.M:, FiRUSS es) 0. Cees 
Acquired Charactess and Stimuli. — Sir E, Ray 
Lankester, K C.B., F.R.S. .. « ae Sa 
Clouds and Shadows.—Chas. Tilden Smit 168 
Winter in India.—H: Hie a - -, - eee 
Recent Researches on Cast Iron. (J/lustvated.) By 
Profy)..O: Arnold, PF. Ris gememretee yes) 14) ileal 
The International Congress of Americanists. . . . 169 
Prof. Edward Divers, F.R.S. 170 
Notes : +. re 170 
Our Astronomical Column :— 
The Solar Eclipse of April 17 . 175 
A Daylight Meteor . E a Se a! Wace 175 
The Nova, or Variable, in Perseus, 871911 175 
A New Star Catalogue . 3 +, eA 175 
The Photographic Transit 176 
Physics and Astrophysics. . . . . . 176 
The Parallax of Nova Lacerta, 1910 176 
Nova Geminorum No.2...... 176 
Portland Cement. ByB By .. Ola. 
Biagueanyindial. . .. . eee 177 
Four Mammal Surveys. By R. L. HPs 8 SS 
Treasury Grants to Universities and University 
Collegesi’..:. . . .. ee. 2 ee 
Fiords in Relation to Earth Movements. By Prof. ~ 
J. W. Gregory, F.R.S. " ~ ev 
societtesiandsAcademies: 3) apeuimnuneneican.) co) nee 183 
BooksyReceived: : . . |= :eeReeReGt > . cCmemmloe 
Diary of Societies. ....... 184 
