728 
NATURE 
[May 26, 1923 

with glucose and methylene blue, placed in an 
evacuated bulb, and exposed to sunlight, oxidises 
the glucose and reduces the methylene blue simul- 
taneously.—J. Orcel: The prochlorites of corundum 
rocks. These minerals, ten analyses of which are 
given, are divided into two sub-groups, ripidolites 
defined by the ratio MgO/FeO=3 and grochauite, 
with a ratio MgO/FeO =10.—Pierre Viennot: The 
Labourd stratum, French Basque region. — Léon 
Moret: The facies of the Senonian sponges of the 
Beausset basin and their conditions of deposit.— 
C. Kilian: The Immidir, branch of the ‘‘ Enceinte 
Tassilienne,’’ Central Sahara.—René Jeannel: Sketch 
of the stocking of Europe by the species of the genus 
Choleva.—R. Anthony and F. Villemin: The lobation 
of the foetal kidney in the primates.——Radu Vladesco : 
Diffraction of light by the eyelashes. The diffraction 
bands seen under certain conditions are due to the 
scales forming the outer envelope of the hair.— 
J. Lopez-Lomba and Mme. Randoin: Contribution 
to the study of B avitaminosis in the pigeon.— 
L. M. Bétances : Cytohemato-genesis in the Metazoa. 
—A. Weber: The inhibiting action of the internal 
medium of batrachians on the fecundation and the 
parthenogenetic activation of their eggs. In Rana 
fusca the internal medium, lymph or blood, behaves 
towards the activated egg as a toxic substance, to 
which the egg becomes permeable after puncture, 
while previously it was immunised against this toxic 
property.—Maurice Aubertot: The dissemination 
and transport of nematodes of the genus Rhabditis 
by Diptera.—R. Courrier : Remarks on the fecunda- 
tion membrane of the egg of the sea-urchin (Para- 
centvotus lividus)—Edouard Chatton and Mme. M. 
Chatton: The influence of bacterial factors upon 
nutrition: the multiplication and sexuality of the 
infusoria.—Robert Ph. Dollfus: The cestode of the 
fine pearls of the Meleagrina of Nossi-Bé. 

Official Publications Received. 
Journal and Proceedings of the Royal Society of Western Australia. 
Vol. 8, 1921-1922. Pp. x+52. (Perth.) 5s. 
Health for School Children: Report of Advisory Committee on Health 
Education of the National Child Health Council, Washington, D.C. 
(School Health Studies, No, 1: Department of the Interior, Bureau 
ge Pp. 75. (Washington: Government Printing Office.) 
cel.ts. 
Department of the Interior: Bureau of Education. Bulletin, 1922, 
No. 36: Report of a Survey of the University of Arizona. Pp. viii+89. 
Bulletin, 1922, No. 50: Educational Directory, 1922-1923. Pp. iii+179. 
15 cents, (Washington : Government Printing Office.) 
Experimental and Research Station, Nursery and Market Garden 
Industries’ Development Society, Ltd., Turner’s Hill, Cheshunt, Herts. 
Fighth Annual Report, 1922. Pp. 66. (Cheshunt.) 
U.S. Department of Agriculture: Weather Bureau. Monthly Weather 
Review. Supplement No, 19: Thermal Belts and Fruit Growing in North 
Carolina. By Henry J. Cox. Appendix: Thermal Belts from the Horti- 
cultural Viewpoint. By W. N. Hutt. Pp. v+106. (Washington : 
Government Printing Office.) 50 cents. 
Annual Report of the Council of the Yorkshire Philosophical Society 
for the Year 1922, presented to the Annual Meeting, February 12th, 1923, 
Pp. 63. (York.) 

Diary of Societies. 
SATURDAY, May 26. 
RoyaL INSTITUTION oF GREAT BRITAIN, at 3.—J. B, McEwen: Musical 
Education. 
MONDAY, May 28. . 
Farapay Soctery (at Institution of Electrical Engineers), at 3.—General 
Discussion on the Physical Chemistry of the Photographie Process.— 
Prof. W. D. Bancroft: Introductory Address—The Theory of Photo- 
graphy.—Section I. 
Emulsion.—Dr, T. Slater Price: Introductory Address. —Prof. R. 
Luther: Effect of Treatment of Gelatin on the Sensitivity of the 
Emulsion,—E. P. Sheppard, F. A. Elliott, and 8. 8S. Sweet: Notes on 
the Photographic Chemistry of Gelatin.—E. P. Wightman, A. P. H. 
Trivelli, and 8. E. Sheppard: Structure of the Photographic Emulsion. 
—Dr. C, Winther: The Solubility of Silver Bromide in Ammonium 
Bromide and Gelatin.—At 5.—Section II. Reactions of the Plate 
during Exposure (including Latent Image).—Dr. F. ©. Toy: Introdu:- 
tory Address—The Mechanism of the Latent Image Formation.—S. E. 
Sheppard, A. P. H. Trivelli, and E. P. Wightman: Exposure Theories. 
—Prof. R. Luther; The Relation between the Size of Silver Bromide 
Grains and Sensitivity.—W. C. Clark: Sensitivity of Silver Halide 
Grains in a Photographie Emulsion.—Dr. J. Errera: The Influence of | 
NO. 2795, VOL. IIT] 
The Physical Chemistry of the Vehicle and of the | 

the Dispersion of Asphalte Solutions on their Light Sensitiveness.— 
Section IIIf. Development and Characteristics of the Developed Plate 
(including Optical Properties, Sensitometry).—O. Bloch : Introductory 
Address—Plate Sensitometry.—Prof. R. Luther: The Characteristic 
Curve.—Prof. R. Luther: Proportional Reducting Methods.—Prof. E. 
Goldberg: The Use of the Neutral Grey Wedge in Sensitometry.— 
T. Thorne-Baker: The Effect of Radiations of very small Wave-lengths 
on Optical Opacity and Gamma.—S. E, Sheppard and F. A. Elliott: 
The Theory of Development.—L. A. Jones: Recent Progress in the 
Sensitometry of Photographic Materials.—L. A. Jones: Some New 
Instruments for use in Photographie Sensitometry.—F. E. Ross: 
Optical Properties of the Photographic Emulsion.—At 8.— Section IV. 
Adsorption Reaction in Photographic Films.—Dr. Luppo-Cramer; 
Introductory Address, — Dr. Luppo-Cramer: Nucleus Isolation and 
Desensitisation.—A. L. Lumiere and A, Secyewetz: The Chemistry of 
the Red Toning of Sulphide-toned Prints.—Prof. R. Luther: Ad- 
sorption of Cuprie Ion by Silver Bromide: Estimation of Traces of 
Copper by a New Catalytic Method.—Prof. R. Luther: Copper as 
Catalyst in Photographic Processes: Catalytic Effects in the Carbon 
Process.—E. R. Bullock: Theory of Photographic Due Mordanting.— 
Dr. J. Plotnikov: Future Problems in Photography. ‘ 
Royat INSTITUTION OF|GREAT BRITAIN, at 3.—Sir Walford Davies : Speech 
Rhythm in Vocal Musie (2). 
RoyaL GeoGRaPHIvAL Society (Anniversary Roce (at Zolian Hall), 
at 5.30, — Presidential Address, — Presentation of Medals and other 
awards, ete. : 
Royat IystiroTe oF Britisa ARcHtTEcts, at 8.—G. Scott: Tradition 
and Originality in Italian Renaissance Architecture. 
ARISTOTELIAN Soctery (at University of London Club, 21 Gower] Street), 
at 8.—C. D, Burns: The Contact of Minds. e 
RoyaL Socrety oF Mepicine (Odontology Section) (Annual General 
Meeting), at 8.—Dr. 8. Wallace: Observations on the Progress of 
Preventive Dentistry. 
TUESDAY, May 29. 
Roya. INSTITUTION OF GREAT Briralin, at 3.—Prof. W. M. Flinders Petrie : 
Discoveries in Egypt (2). ‘ 
RoyAL Socrety oF Mepicine (Medicine Section), at 5.80.—Annual General 
Meeting. 
ZootoaicaL Society oF Lonpon, at 5.30.—C. Tate Regan: The Skeleton 
of Lepidosteus, with Remarks.on the Origin and Evolution of the Lower 
Neopterygian Fishes.—Dr. C. F. Sonntag : The Comparative Anatomy of 
the Tongues of the Mammalia. IX. Edentata, Dermoptera, and 
Insectivora.—S. Maulik : New Cryptosome Beetles. 
WEDNESDAY, May 30. 
Roya Soctety or Arts, at 4.30.—A. J. Sewell: The History and 
Development of the Perambulator and Invalid Carriage. 
Roya Microscopicat Society (Industrial Applications of the Microscope 
Section), at 7.—M. 'T. Denne: An Improved Apparatus for the Prodne- 
tion of Photomicrographs.—C, A. Newton: A New Form of Microsco) 
Lamp for Easy Exchange of Paralleliser and Polariser.—M. P. Swift: 
A Hutchinson Universal Goniometer.—At 8.—J. M. Coon: The Micro- 
scopical Examination of China Clay.—H. B. Milner: The Microscopical 
Investigation of Sands for various Industrial Purposes. 
THURSDAY, May 381. 
Roya InstitvTION oF Great Britain, at 3.—Sir William M. Bayliss: 
The Nature of Enzyme Action (1). ° 
Roya Society, at 4.30.—Dr. E. Griffiths and Dr. G. W. C. Kaye: The 
Measurement of Thermal Conductivity, No. 1.—Dr. G. W. C. Sg 
and J. K. Roberts: The Thermal Conductivities of Metal Crys’ 
I. Bismuth.—C. V. Drysdale and 8S, Butterworth: The Distribution of 
the Magnetic Field and Return Current round a Submarine Cable 
carrying Alternating Current.—Prof. 8. Russ: The Effeet of X-rays of 
different Wave-lengths upon some Animal Tissues.—Dr. E. F. Armstrong 
and Dr. T. P. Hilditeh: A Study of Catalytic Actions at Solid Surfaces. 
Part XI. The Action of Alumina and certain other Oxides in promoting 
the Activity of Nickel Catalyst.—N. K. Adam: The Structure of Thin 
Films. Part IV. Benzene Derivatives. A Condition of Stability in 
Monomolecular Films.—N. K. Adam: The Structure of Thin Films, 
Part V.—W. B. Rimmer: The Spectrum of Ammonia, ~ 
INSTITUTION OF ELECTRICAL ENGINEERS, at 6 (Annual General Meeting).— 
Presentation to the Institution of (a) An oil painting of the late Dr. 
Silvanus Thompson ; () Dr. Thompson's Library; (c) A bronze bust 
of Dr. Thompson, by Mr. Gilbert Bayes. 
FRIDAY, June 1. 
Rovat Socrety oF Arts (Indian Section), at 4.30.— A. Kendall: The 
Participation of India and Burma in the British Empire Exhibition, 1924, 
Royat AstronomicaL Socrery (Geophysical Discussion), at 5. —The 
Variation of Latitude in relation to the Physical Properties of the 
Earth's Interior. Chairman, Lord Rayleigh. Speakers, R. Stoneley, 
Dr, H. Jeffreys, and others. Z 
ParLotocicat Society (at University College), at 5.30.—Dr. H. Bradley: 
Dictionary Evening. ; 
Roya. INsTITUTION OF GREAT Britatn, at 9.—Prof. H. A. Lorentz: The 
Radiation of Light. 
SATURDAY, Junr 2. 
Roya InsTiruTION OF GREAT Brirarn, at 3.—Dr. A. W. Hill: The 
Vegetation of the Andes. 
British PsycsoLocicat Socrery (at University College), at 3.—Sir 
Charles Walston : Some Aspects of the Philosophy of Harmonism and 
Future Experiments. 
PUBLIC LECTURES. 
THURSDAY, May 31. 
Sr. Mary's Hosprrat (Institute of Pathology and Research), at 4.30.— 
Prof. L, Hill: New Ideas concerning the Biological Action of Light. _ 
University CoLiece, at 5.80,—Prof, A. Cippico: Ludovico Ariosto (in 
Italian). 
FRIDAY, Just 1. 
University CouLecr, at 5.30.—Dr. P. Lang: Contemporary Swiss 
Literature. (Succeeding Lectures on June 8 and 15.) 
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