RECENT PAPERS IN THE ‘PHILOSOPHICAL TRANSACTIONS/ 
1916-18. 
Series A.—Mathematical and Physical. 
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.R.S. 
Pp. 37. Price 2s. 
A 555. On Phenomena Relating to the Spectra of Hydrogen and Helium. -By T. R. 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 d. 
A 556. Numerical Results of the Theory of the Diffraction of a Plane Electromagnetic Wave by a 
Perfectly Conducting Sphere. By J. Proudman, A. T. Doodson, and G. Kennedy. Pp. 36. 
Price 3s. 
A 557. Bakerian Lecture. —On X-Rays and the Theory of Radiation. By C. G. Barela, F.R.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.R.S. Pp. 50 ; 15 Plates. Price 3s. 6 d. 
A 559. On the Photographic Spectra of Meteorites. By Sir William Crookes, O.M., F.R.S., LL.D., 
D.Sc., &c. Pp. 20; 2 Plates. Price 3s. 6 d. 
A 560. Title, Contents, Index, &c., Vol. 217. Pp. 10. Price 6tf. 
A 561. The Solar and Lunar Diurnal Variations of Terrestrial Magnetism. By S. Chapman, M.A., 
D.Sc., Fellow and Lecturer of Trinity College, Cambridge, and Chief Assistant at the Royal 
Observatory, Greenwich. Pp. 118. Price 7s. 6 d. 
Series B. — Biological. 
B 352. Analyses of Agricultural Yield. Part III.—The Influence of Natural Environmental Factors 
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 Sparidae and Labridae. By 
J. Howard Mummery, D.Sc. (Hon.), Penn., M.R.C.S. Pp. 19; 2 Plates. Price 2s. 
B 355. The Cytomorphosis of the Marsupial Enamel-Organ and its Significance in Relation to the 
Structure of the Completed Enamel. By J. Thornton Carter. Pp. 35; 4 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 Research 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. Stores, D.Sc. (Lond.), 
Ph.D. (Munich), Fellow and Lecturer in Palgeobotany, 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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