KECENT PAPERS IN^ THE \PHILOSOPHICAL TRANSACTIONS/ 
1918-19. 
Series A.—Mathematical and Physical. 
A 567. Surface Reflexion of Earthquake Waves. By George W. Walker, A.R.C.Sc., M.A., F.R.S., 
formerly Fellow of Trinity College, Cambridge. Pp. 21; 2 Plates. Price 2s. 6d, 
A 568. Monoclinic Double Selenates of the Iron Group. By A. E. H. Tutton, D.Sc., M.A., F.R.S. 
Pp. 46. Price 3s. 
A 569. Title, Contents, Index, &c., Vol. 218. Pp. 10. Price 6d. 
Volume 218 (1919), 442 pp., ^Adth 4 Plates, Price £1 15s. 
A 570. The Magnetic Re-Survey of the British Isles for the Epoch January 1, 1915. By George W. 
Walker, A.R.C.Sc., M.A., F.R.S., formerly Fellow of Trinity College, Cambridge, and 
Appendix by Arthur Hubert Cox, M.Sc., Ph.D., F.G.S. Pp, 135; Plates 1-5 and 
Ap. 1-Ap. 3. Diagrams 1-6. Price 15s. 
Appendix issued separately :— 
A Report on Magnetic Disturbances in Northamptonshire and Leicestershire and their Relations 
to the Geological Structure. By Arthur Hubert Cox, M.Sc., Ph,D., F.G.S. Pp. 63; 
3 Plates. Price 7s. 6d. 
Volume 219 (1919), 135 pp., with 9 Plates and 6 Diagrams. Price 17s. 6d. 
A 671. Tidal Friction in the Irish Sea. By G. I. Taylor, M.A. Pp. 33. Price 3s. Qd. 
A 572. Electromagnetic Integrals. By Sir G. Greenhill, F.R.S. Pp. 31. Price 3s. 
A 573. Bakerian Lecture, 1918.—Experiments on the Artiflcial Production of Diamond. By 
The Hon. Sir Charles Algernon Parsons, K.C.B., F.R.S. Pp. 41. Price 4s. Qd. 
Series B. — Biological. 
B 360. The Structime, Evolution and Origin of the Amphibia.—The “ Orders ” Rachitomi and 
Stereospondyli. By D. M. S. Watson, Lecturer in Vertebrate Palaeontology in University 
College, London. Pp. 73; 2 Plates. Price 7s. 6d. 
B 361. On the Structure and Biology of Archotermopsis, together with Descriptions of New Species of 
Intestinal Protozoa, and General Observations on the Isoptera. By A. D. Imms, M.A., D.Sc., 
Chief Entomologist, Rothampsted Experimental Station, Harpenden. Pp. 106; 8 Plates. 
Price 12s. 6d. 
B 362. An Investigation into the Periodicity of Measles Epidemics in the Different Districts of London 
for the Years 1890-1912. By John Brownlee, M.D., D.Sc. Pp. 10. Price Is. 6d. 
B 363. The Pelmatoporinae, an Essay on the Evolution of a Group of Cretaceous Polyzoa. By 
W. D. Lang, Sc.D., F.G.S. Pp. 38. Price 4s. 6d. 
B 364. Recherches Anatomo-Cliniques sur les Nevromes d’Amputations Douloureux. Nouvelles 
Contributions a I’Etude de la Regeneration Nerveuses et du Neurotropisme. Par le 
Prof. G. Marinesco (Bucarest), Membre Correspondant de I’Academie de Medecine de Paris ; 
Memhre de FAcademie Roumaine, etc. (Travail du Laboratoire de Recherches Pathologiques, 
F.C.C. Maudsley Hospital.) Pp. 76; 36 Plates. Price 10s. 6d. 
B 365. The Epithelial Sheath of Hertwig in the Teeth of Man, with Notes on the Follicle and 
Nasmyth’s Membrane. By J, Howard Mummery, D.Sc. (Hon.), M.R.C.S. Pp. 16 ; 2 Plates. 
Price 3s. &d. 
Cloth cases for binding the volumes of the ‘ Philosophical Transactions.’ Pricej2s. 6d. 
Published foe the ROYAL SOCIETY by! 
Harrison and Sons, 44-47, St. Martin’s Lane, London, W.C. 2. 
