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RECENT PAPERS IN THE ‘PHILOSOPHICAL TRANSACTIONS,’ 
1911-1912. 
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Senes A.—Mathematical and Physical. 
The Eanetic 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. 
Title, Contents, Index, &c., Vol. 211. Pp. 10. Price 6d. 
Bakerian Lecture. —On the Variation of the Specific Heat of Water, with Experiments by a 
New Method. By H. L. Callendar, M.A., LL.D., F.E.S., Professor of Physics at the Imperial 
College of Science and Technology, London, S.W. Pp. 32. Price Is. 6d. 
A Critical Study of Spectral Series.—Part II. The p and s Sequences and the Atomic Volume 
Term. By W. M. Hicks, Sc.D., F.R.S. Pp. 41. Price 2s. 
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. 
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 New Treatment of Optical Aberrations. By R. A. Sampson, F.R.S. Pp. 37. Price 2s. 
On the Variation vdth 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 William Esson, 
M.A., F.R.S., Savilian Professor of Geometry in the University of Oxford. Pp. 18. Price Is. 
On the Emission Velocities of Photo-Electrons. By A. Ll. Hughes, M.Sc., B.A., Research 
Scholar of Emmanuel College, Cambridge. Pp. 22. Price Is. 6d. 
Series B. — Biological. 
Lapworthura: A Typical Brittlestar of the Silurian Age; with Suggestions for a New 
Classification of the Ophiuroidea. By Igerna B. J. Sollas, B.Sc., Lecturer on Zoology in 
Newnham College, Cambridge, and W. J. Sollas, F.E.S., Professor of Geology and 
Palaeontology in the University of Oxford. Pp. 20; 2 Plates. Price Is. 6d. 
On the Fossil Flora of the Forest of Dean Coalfield (Gloucestershire), and the Relationships of 
the Coalfields of the West 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. 6i. 
On the Discovery of a Novel Type of Flint Implements below the Base of the Red Crag of 
Sufiblk, proving the Existence of Skilled Workers of Flint in the Pliocene Age. By Sir Eay 
Lankester, K.O.B., D.Sc., LL.D., F.R.S. Pp. 54; 4 Plates. Price 7s. 
On the Distribution of the Nerves of the Dental Pulp. By J. Howard Musimery, M.E.C.S., 
L.D.S. Pp. 13 ; 1 Plate. Price 2s. 
The Human Electrocardiogram : A Preliminary Investigation of ,Young Male Adults, to Form a 
Basis for Pathological Study. By Thomas Lewis and M. D. D. Gilder. Pp. 26; 2 Plates. 
Price 2s. 
Title, Contents, Index, &c., Vol. 202. Pp. 10. Price %d. 
A Metrical Analysis of Chromosome Complexes, showing Correlation of Evolutionary 
Development and Chromatin Thread-Width throughout the Animal Kingdom. By Captain 
C. F. U. Meek, M.Sc., F.L.S., F.Z.S. Pp. 74; 5 Plates. Price 5s. 
Petrifactions of the Earliest European Angiosperms. By Marie C. Stores, D.Sc., Ph.D., F.L.S., 
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