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KECENT 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 Integra 
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, Eoyal Observatory, 
Greenwich. Pp. 51. Price 2s. Qd. 
A 483. Title, Contents, Index, &c., Vol. 211. Pp. 10. Price 6d. 
A 484. 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. fid. 
A 485. 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.E.S. Pp. 41. Price 2s. 
A 48fi. Some Phenomena of Sunspots and of Terrestrial Magnetism at Kew Observatory. By 
C. Chree, Sc.D., LL.D., F.E.S., Superintendent of Kew Observatory. Pp. 42. Price 2s. 
A 487. Physico-Chemical Determinations at High Pressures by Optical Methods. (Eesearch executed 
in the Davy Faraday Eesearch Laboratory of the Eoyal Institution of Great Britain, 
London, W.). By Walter Wahl, Ph.D., Eosenberg Eesearch Fellow of the University of 
Helsingfors. Pp. 32. Price Is. fid. 
A 488. A New Treatment of Optical Aberrations. By E. A. Sampson, F.E.S. Pp. 37. Price 2s. 
Series B. — Biological. 
B 288. Lapworthuria: 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. fid. 
B 289. On the Fossil Flora of the Forest of Dean Coalfield (Gloucestershire), and the Eelationships 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. fid. 
B 290. On the Discovery of a Novel Type of Flint Implements below the Base of the Eed Crag of 
Suffolk, proving the Existence of Skilled Workers of Flint in the Pliocene Age. By Sir Eay 
Lankester, K.C.B., D.Sc., LL.D., F.E.S. Pp. 54; 4 Plates. Price 7s. 
B 291. On the Distribution of the Nerves of the Dental Pulp. By J. Howard Mummery, M.E.C.S., 
L.D.S. Pp. 13; 1 Plate. Price 2s. 
B 292. 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. 2fi; 2 Plates. 
Price 2s. 
B 293. Title, Contents, Index, &c., Vol. 202. Pp. 10. Price fid. 
B 294. 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. 
B 295. Petrifactions of the Earliest European Angiosperms. By Marie C. Stores, D.Sc., Ph.D., F.L.S., 
Fellow of University College, London. Pp. 2fi; 3 Plates. Price 2s. fid. 
Cloth cases for binding the ‘ Philosophical Transactions ’ can be obtained of Harrison and Sons, 
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