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RECENT PAPERS IN THE ‘PHILOSOPHICAL TRANSACTIONS, 
1913. 
Series A.—Mathematical and Physical. 
A 500. The Capacity for Heat of Metals at Different Temperatures, being an Account of Experiments 
performed in the Research Laboratory of the University College of South Wales and 
Monmouthshire. By E. H. Griffiths, Se.D., F.R.S.; and Ezer Griffiths, B.Sc., Fellow of 
the University of Wales. Pp. 67. Price 3s. 6 d. 
A 501. On the General Theory of Elastic Stability. By R. V. Southwell, B.A., Fellow of Trinity 
College, Cambridge, Pp. 58. Price 3s. 
A 502. Some Phenomena of Sunspots and of Terrestrial Magnetism.—Part II. By C. Chree, Sc.D., 
LL.D., F.R.S., Superintendent of Kew Observatory. Pp. 33. Price 2s. 
A 503. On the Diurnal Variations of the Earth’s Magnetism produced by the Moon and Sun. By 
S. Chapman, B.A., D.Sc., Chief Assistant at the Royal Observatory, Greenwich. Pp. 43. 
Price 2s. 
A 504. A Critical Study of Spectral Series.—Part III. The Atomic Weight Term and its Import in the 
Constitution of Spectra. By W. M. Hicks, F.R.S. Pp. 98. Price 4s. 6 cl. 
A 505. On the Self-inductance of Circular Coils of Rectangular Section. By T. R. Lyle, M.A., Sc.D., 
F.R.S. Pp. 15. Price Is. 
A 506. A Method of Measuring the Pressure Produced in the Detonation of High Explosives or by the 
Impact of Bullets. By Bertram Hopkinson, F.R.S. Pp. 20. Price Is. 6 d. 
A 507. Gravitational Instability and the Nebular Hypothesis. By J. H. Jeans, M.A., F.R.S. Pp. 29. 
Price Is. 6 d. 
A 508. Title, Contents, Index, &c., Vol. 213. Pp. 8. Price 6 d. 
Series B. — Biological. 
B 301. The Changes in the Breathing and the Blood at Various High Altitudes. By Mabel Purefoy 
FitzGerald. Pp. 21. Price Is. 6 d. 
B 302. Title, Contents, Index, &c., Vol. 203. Pp. 10. Price 6 d. 
B 303. On the Comparative Anatomy and Affinities of the Araucarinese. By Robert Boyd Thomson, 
University of Toronto. Pp. 50; 7 Plates. Price 4s. 
B 304. On Onychaster, a Carboniferous Brittle-star. By Igerna B. J. Sollas, Newnham College, 
Cambridge. Pp. 12 ; 2 Plates. Price Is. 
B 305. An Automatic Method for the Investigation of Velocity of Transmission of Excitation in Mimosa. 
By Prof. J. C. Bose, M.A., D.Sc., C.S.I., Presidency College, Calcutta. Pp. 35. Price 2s. 
B 306. The Evolution of the Cretaceous Asteroidea. By W. K. Spencer, B.A., F.G.S. Pp. 79; 
7 Plates. Price 5s. 
B 307. The Soil Solution and the Mineral Constituents of the Soil. By Alfred Daniel Hall, M.A., 
F.R.S., Winifred Elsie Brenchley, D.Sc., and Lilian Marion Underwood, B.Sc. 
Pp. 22. Price Is. 6 d. 
B 308. A Study of the Skull of a Dicynodon by Means of Serial Sections. By Igerna B. J. Sollas, 
B.Sc., Fellow of Newnham College, Cambridge, and W. J. Sollas, F.R.S., Professor of 
Geology and Palaeontology in the University of Oxford. Pp. 25; 2 Plates. Price 2s. 
B 309. An Investigation by Pedigree Breeding into the Polymorphism of Papilio polytes, Linn. By 
J. C. F. Fryer, M.A., F.E.S., Fellow of Gonville and Caius College, late Balfour Student in 
the University of Cambridge. Pp. 28. Price Is. 6 d. 
B 310. On the Experimental Hybridization of Echinoids. By Cresswell Shearer, Walter de 
Morgan, and H. M. Fuchs. Pp. 108; 7 Plates. Price 10s. 6 d. 
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