RECENT PAPERS IN THE ‘PHILOSOPHICAL TRANSACTIONS/ 
1916-18. 
Senes A.—Mathematical and Physical. 
A 552. Seventh Memoir on the Partition of Numbers. A Detailed Study of the Enumeration of th© 
Partitions of Multipartite Numbers. By Major P. A. MacMahon, E.A., D.Sc., Sc.D., F.E.S. 
Pp. 33. Price 2s. 
A 553. On the Kinetic Theory of a Gas. Part II.—A Composite Monatomic Gas : Diffusion, Viscosity, 
and Thermal Conduction. By S. Chapman, M.A., D.Sc., Fellow and Lecturer of Trinity 
College, Cambridge. Pp. 83. Price 4s. 
A 554. Monoclinic Double Selenates of the Nickel Group. By A. E. H. Tutton, D.Sc., M.A., F.E.S. 
Pp. 37. Price 2s. 
A 555. On Phenomena Eelating to the Spectra of Hydrogen and Helium. By T. E. Merton, D.Sc. 
(Oxon), Lecturer in Spectroscopy, University of London, King’s College, and J. W. Nicholson, 
M.A., D.Sc., Professor of Mathematics in the University of London. Pp. 42; 2 Plates. 
Price 2s. 6 cl. 
A 556. Numerical Eesults of the Theory of the Diffraction of a Plane Electromagnetic Wave by a 
Perfectly Conducting Sphere. By J. Proud man, A. T. Doodson, and G. Kennedy. Pp. 36. 
Price 3s. 
A 557. Bakerian Lecture.— On X-Eays and the Theory of Eadiation. By C. G. Barkla, F.E.S., 
Professor of Natural Philosophy in the University of Edinburgh. Pp. 46. Price 3s. 
A 558. A Critical Study of Spectral Series. Part IV.—The Structure of Spark Spectra. By 
W. M. Hicks, F.E.S. Pp. 50; 15 Plates. Price 3s. 6 d. 
A 559. On the Photographic Spectra of Meteorites. By Sir William Crookes, O.M., F.E.S., LL.D., 
D.Sc., etc. Pp. 20; 2 Plates. Price 3s. 6 d. 
Series B. — Biological. 
B 352. Analyses of Agricultural Yield. Part III.—The Influence of Natural Environmental Factor© 
upon the Yield of Egyptian Cotton. By W. Lawrence Balls, Sc.D., late Fellow of 
St. John’s College, Cambridge. Pp. 67. Price 5s. 
B 353. An Investigation into the Periodicity of Measles Epidemics in London from 1703 to the Present 
Day by the Method of the Periodogram. By John Brownlee, M.D., D.Sc. Pp. 26. 
Price 2s. 
B 354. On the Structure and Development of the Tubular Enamel of the Sparidse and Labridse. By 
J. Howard Mummery, D.Sc. (Hon.), Penn., M.E.C.S. Pp. 19 ; 2 Plates. Price 2s. 
B 355. The Cytomorphosis of the Marsupial Enamel-Organ and its Significance in Eelation to the 
Structure of the Completed Enamel. By J. Thornton Carter. Pp. 35; 2 Plates. Price 5s. 
B 356. The Development of the Pancreas, the Pancreatic and Hepatic Ducts, in Trichosurus Vulpecula. 
By Margaret Tribe, M.Sc. (Lond.), Percy Macgregor Eesearch Scholar. Pp. 44; 1 Plate. 
Price 5s. 
B 357. The Fossil Human Skull found at Talgai, Queensland. By Stewart Arthur Smith, M.B., 
Ch.M. Pp. 37; 7 Plates. Price 5s. 
B 358. New Bennettitean Cones from the British Cretaceous. By Marie C. Stopes, D.Sc. (Lond.), 
Ph.D. (Munich), Fellow and Lecturer in Palseobotany, University College, London. Pp. 52; 
6 Plates. Price 10s. 
B 359. Title, Contents, Index, &c., Vol. 208. Pp. 10. Price 6 d. 
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