BECENT PAPEBS IN THE ‘PHILOSOPHICAL TBANSACTIONS,’ 
1917-19. 
Series A.—Mathematical and Physical. 
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 35. §d. 
A 560. Title, Contents, Index, &c., Yol. 217. Pp. 10. Price 6 d. 
Volume 217 (1918), with 20 Plates, Price £1 11s. 
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. 
A 562. The Specific Heat of Aqueous Solutions, with Special Reference to Sodium and Potassium 
Chlorides. By W. R. Bousfield, M.A., K.C., F.R.S., and C. Elspeth Bousfield. Pp. 38. 
Price 3s. 
A 563. Bakerian Lecture, 1917.—The Configurations of Rotating Compressible Masses. By 
J. H. Jeans, M.A., F.R.S. Pp. 54. Price 4s. 6 d. 
A 564. 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. Price 5s. 
A 565. On Osmotic Pressures Derived from Vapour-pressure Measurements : Aqueous Solutions of Cane 
Sugar and Methyl Glucoside. By the Earl of Berkeley, F.R.S., E. G. J. Hartley, B.A. 
(Oxon), and C. V. Burton, B.Sc. (London). Pp. 55. Price 3s. 6 d. 
A 566. The Ultra-Violet Band of Ammonia, and its Occurrence in the Solar Spectrum. By A. Fowler, 
F.R.S., Professor of Astrophysics, and C. C. L. Gregory, B.A., Research Student, Imperial 
College, South Kensington. Pp. 22 ; 1 Plate. Price 3s. 
Series B. — Biological. 
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.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 Vulpeeula. 
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. Stopes, D.Sc. (Lond.), 
Ph.D. (Munich), Fellow and Lecturer iu Paleobotany, University College, London. Pp. 52 
6 Plates. Price 10s. 
B 359. Title, Contents, Index, &c., Vol. 208. Pp. 10. Price 6 d. 
Volume 208 (1918), with 24 Plates, Price £2 7s. 
Cloth cases for binding the volumes of the ‘ Philosophical Transactions.’ Price 2s. 6<f. 
Published for the EOYAL SOCIETY by 
Harrison and Sons, 44-47, St. Martin’s Lane, London, W.C. 2. 
