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RECENT PAPERS IN THE ‘PHILOSOPHICAL TRANSACTIONS,’ 
1911-1912. 
Series A.—Mathematical and Physical. 
A 481. On the Series of Sturm and Liouville, as Derived from a Pair of Fundamental Integral 
Equations instead of a Differential Equation. By A. C. Dixon, F.R.S., Professor of 
Mathematics, Queen’s University, Belfast. Pp. 22. Price l5. 
A 482. The Kinetic Theory of a Gas Constituted of Spherically Symmetrical Molecules. By 
S. Chapman, M.Sc., Trinity College, Cambridge; Chief Assistant, Royal Observatory, 
Greenwich. Pp. 51. Price 2s. 6d. 
A 483. Title, Contents, Index, &c., Vol. 211. Pp. 10. Price Cd. 
A 484. Bakerian Lecture. —On the Variation of the Specific Heat of Water, with Experiments by a 
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College of Science and Technology, London, S.W. Pp. 32. Price Is. 6(i. 
A 485. A Critical Study of Spectral Series.—Part 11. The p and s Sequences and the Atomic Volume 
Term. By W. M. Hicks, Sc.D., F.R.S. Pp. 41. Price 2s. 
A 486. Some Phenomena of Sunspots and of Terrestrial Magnetism at Kew Observatory. By 
C. Chree, Sc.D., LL.D., F.R.S., Superintendent of Kew Observatory. Pp. 42. Price 2s. 
A 487. Physico-Chemical Determinations at High Pressures by Optical Methods. (Research executed 
in the Davy Faraday Research Laboratory of the Royal Institution of Great Britain, 
London, W.). By Walter Wahl, Ph.D., Rosenberg Research Fellow of the University of 
Helsingfors. Pp. 32. Price Is. 6d. 
A 488. A New Treatment of Optical Aberrations. By E. A. Sampson, F.R.S. Pp. 37. Price 2s. 
A 489. On the Variation with Temperature of the Rate of a Chemical Change. By A. Vernon 
Harcourt, M.A., Hon. D.Sc. Oxon, F.R.S. With an Appendix. By AVilliam Esson, 
M.A., F.R.S., Savilian Professor of Geometry in the University of Oxford. Pp. 18. Price Is. 
Series B. — Biological. 
B 289. On the Fossil Flora of the Forest of Dean Coalfield (Gloucestershire), and the Relationships of 
the Coalfields of the AA^est of England and South Wales. By E. A. Newell Arber, M.A., 
F.L.S., F.G.S., Trinity College, Cambridge, University Demonstrator in Palseobotany. Pp. 49; 
3 Plates. Price 3s. 6d. 
B 290. On the Discovery of a Novel Type of Flint Implements below the Base of the Red Crag of 
Suffolk, proAung the Existence of Skilled Workers of Flint in the Pliocene Age. By Sir Ray 
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B 291. On the Distribution of the Nerves of the Dental Pulp. By J. Howard Mummery, M.R.C.S., 
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B 292. The Human Electrocardiogram: A Preliminary Investigation of Young Male Adults, to Form a 
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B 293. Title, Contents, Index, &c., Vol. 202. Pp. 10. Price 6d. 
B 294. A Metrical Analysis of Chromosome Complexes, showing Correlation of Evolutionary 
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B 295. Petrifactions of the Earliest European Angiosperms. By Marie C. Stopes, D.Sc., Ph.D., F.L.S., 
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