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A. 396. Modified Apparatus for the Measurement of Colour and its Application to the Determination of 
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A. 397. The Pressure of Explosions.—Experiments on Solid and Gaseous Explosives. Parts I. and II. 
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A. 398. Fifth and Sixth Catalogues of the Comparative Brightness of the Stars—in Continuation of 
those Printed in the ‘Philosophical Transactions of the Royal Society’ for 1796-99. By 
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Col. J. Herschel, R.E., F.R.S. Pp. 49. Price 2s. 
A. 399. On the Accurate Measurement of Ionic Velocities, with Applications to Various Ions. By 
R. B. Denison, M.Sc., Ph.D., and B. D. Steele, D.Sc. Pp. 16. Price Is. 
A. 400. On Mathematical Concepts of the Material World. By A. 1ST. Whitehead, Sc.D., F.R.S., 
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A. 401. Title, Contents, Index, &c., Vol. 205. Pp. 10. Price Qd . 
A. 402. The Combination of Hydrogen and Oxygen in Contact with Hot Surfaces. By William 
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Manchester, and Fellow of Victoria University, and Richard Vernon Wheeler, B.Sc., 
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A. 403. On the Periodicities of Sunspots. By Arthur Schuster, F.R.S. Pp. 32. Price Is. 6 d . 
A. 404. Ionic Size in Relation to the Physical Properties of Aqueous Solutions. By W. R. Bousfield, 
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A. 405. On the Figure and Stability of a Liquid Satellite. By Sir G. H. Darwin, K.C.B., F.R.S., 
Plumian Professor and Fellow of Trinity College, Cambridge. Pp. 88. Price 4s. 
A. 406. The Asymptotic Expansion of Integral Functions defined by Taylor’s Series. By E. W. Barnes, 
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B. 242. On Endophytic Adaptation shown by Erysiphe graminis DC. under Cultural Conditions. By 
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B. 243. Contributions to the Physiology of Mammalian Reproduction.—Part I. The (Estrous Cycle in 
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Marshall, Carnegie Fellow in the University of Edinburgh; and William A. .Tolly, 
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B. 244. The Morphology of the Ungulate Placenta, particularly the Development of that Organ in the 
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B. 245. Further Experiments and Histological Investigations on Intumescences, with some Observations 
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B. 246. Some Observations on W'elwitscMa mirabilis, Hooker,/. By H. H. W. Pearson, M.A., F.L.S., 
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B. 247. The Araucariese, Recent and Extinct. By A. C. Seward, F.R.S., Fellow of Emmanuel College, 
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