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A. 340. On the Laws Governing Electric Discharges in Gases at Low Pressures. By W. E. Carr, B.A., 
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A. 341. On the Dependence of the Eefractive Index of Gases on Temperature. By George IV. Walker, 
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A. 342. Solar EcHpse of 1900, May 28.— General Discussion of Spectroscopic Eesults. By J. Evershed 
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A. 343. The Electrical Conductivity Imparted to a Vacuum by Hot Conductors. By 0. W. Eichardson 
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A. 344. On the Formation of Definite Figures by the Deposition of Dust. By John Attken, F.E.S, 
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A. 345. Title, Contents, Index, &c., Vol. 201. Price M. 
A. 346. Bakerian Lecture.—On the Constitution of the Copper-Tin Series of Alloys. By C. T. Heycock, 
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A. 347. The Combination of Hydrogen and Chlorine Under the Influence of Light. By P. V. Bevan, 
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A. 348. Meteorological Observations obtained by the Use of Kites off the West Coast of Scotland, 1902. 
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A. 349. The Elasmometer, a New Interferential Form of Elasticity Apparatus. By A. E. H. Tutton, 
D.Sc., F.E.S. Price Is. 6d. 
A. 350. The Mechanical Forces Acting on a Charged Electric Condenser Moidng through Space. By 
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Series B. — Biological. 
B. 210. The Structure and Development of the Stem in the Pteridophyta and Gymnosperms. By 
Edward C. Jeffrey, Ph.D. (Harvard). Price 3s. 
B. 211. On the Structure of the Gills of the Lamellibranchia. By W. G. Eidewood, D.Sc., F.L.S., 
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B. 212. The Development of Echinus Esculentus, together with some Points in the Development of 
E. Miliaris and E. Acutus. By E. W. MacBride, M.A., D.Sc. (Lond.), sometime Fellow of 
St. John’s College, Cambridge; Strathcona Professor of Zoology in the McGill University, 
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B. 213. Title, Contents, Index, &c., Vol. 195. Price Qd. 
B. 214. The Seed-Fungus of Lolium Temulentum, L., the Darnel. By E. M. Freeman, M.S., University 
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B. 215. On the Histology of Uredo disperse, Erikss., and the “Mycoplasm” Hypothesis. By 
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B. 216. The CEstrous Cycle and the Formation of the Corpus Luteum in the Sheep. By Francis H. A. 
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B. 217. On the Evolution of the Proboscidea. By C. W. Andrews, D.Sc., F.G.S., British Museiun 
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B. 218. Experiments in Hybridization, ivith Special Eeference to the Effect of Conditions on Dominance. 
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