RECENT PAPERS IN THE ‘PHILOSOPHICAL TRANSACTIONS/ 
1917-19. 
A 561. 
A 562. 
A 563. 
A 564. 
A 565. 
A 566. 
A 567. 
A 568. 
A 569. 
B 353. 
B 354. 
B 355. 
B 356. 
B 357. 
B 358. 
B 359. 
Series A.—Mathematical and Physical, 'ft 
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 ^oyal 
Observatory, Greenwich. Pp. 118. Price 7s. 6d. 
The Specific Heat of Aqueous Solutions, with Special Eeference to Sodium and Potassium 
Chlorides. By W. E. Bousfield, M.A., K.C., F.E.S., and C. Elspeth Bousfield. Pp. 38. 
Price 3s. 
Bakerian IiECTURE, 1917.—The Configurations of Eotating Compressible Masses. By y 
J. H. Jeans, M.A., F.E.S. Pp. 54. Price 4s. fid. 
On the Propagation of Sound in the Free Atmosphere and the Acoustic Efficiency of Fog-signal 
Machinery : An Account of Experiments Carried Out at Father Point, Quebec, September, ■ 
1913. By Louis Vessot King, M.A. (Cantab.), D.Sc. (McGill), Associate Professor of Physics, 
McGill University, Montreal. Pp. 83 ; 1 Plate. PKce 5s. 
On Osmotic Pressures Derived from Vapour-pressure Measurements ; Aqueous Solutions of Cane r' 
Sugar and Methyl Glucoside. By the Earl oL Berkeley, F.E.S., E. G. J. Hartley, B.A. 
(Oxon), and C. V. Burton, B.Sc. (London). Pp. 55. Price 3s. fid. 
The Ultra-Violet Band of Ammonia, and its Occurrence in the Solar Spectrum. By A. Fowler, 
F.E.S., Professor of Astrophysics, and C. C. L. Gregory, B.A., Eesearch Student, Imperial 
College, South Kensington. Pp. 22 ; 1 Plate. Price 3s. 
Surface Eeflexion of Earthquake Waves. By George W. Walker, A.E.C.Sc., M.A., F.E.S., .' 
formerly Fellow of Trinity College, Cambridge. Pp. 21; 2 Plates. Price 2s. 6d. 
Monoclinic Double Selenates of the Iron Group. By A. E. H. Tutton, D.Sc., M.A., F.E.S. 
Pp. 4fi. Price 3s. 
Title, Contents, Index, &c,, VoL 218. Pp. 10. Price 6d. 
Volume 218 (1919), 442.pp., with 4 Plates, Price £1 15s. 
Series B.- — Biological. 
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. 
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. 
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; 4 Plates. Price 5s. 
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 5.S. 
The Fossil Human Skull found at Talgai, Queensland. By Stewart Arthur Smith, M.B., 
Ch.M. Pp. 37; 7 Plates. Price 5s. 
New Bennettitean Cones from the British Cretaceous. By Marie C. Stores, D.Sc. (Lond.), 
Ph.D. (Munich), Fellow and Lecturer in Palseobotany, University College, London. Pp. 52; 
6 Plates. Price 10s. 
Title, Contents, Index, &c., Vol. 208. Pp. 10. Price 6d. 
Volume 208 (1918), 442 pp., with 24 Plates, Price £2 7s. 
V , 
Cloth cases for binding the volumes of the ‘ Philosophical Transactions.' Price 2s. 6d. 
Published for the ROYAL SOCIETY by 
Harrison and Sons, 44-47, St. Martin’s Lane, London, W.C. 2. 
s. 
