RECENT PAPERS IN THE ‘PHILOSOPHICAL TRANSACTIONS,’ 
1918-19. 
A 568. 
A 569. 
A 570. 
A 571. 
A 572. 
A 573. 
A 574. 
B 360. 
B 361. 
B 362. 
B 363. 
B 364. 
B 365. 
Series A.-—Mathematical and Physical, 
Monoclinic Double Selenates of the Iron Group. By A. E. H. Tutton, D.Sc., M.A., F.K.S. 
Pp. 46. Price 3s. 
Title, Contents, Index, &c., Vol. 218. Pp. 10. Price Qd. 
Volume 218 (1919), 442 pp., with 4 Plates, Price £1 15s. 
The Magnetic Ee-Survey of the British Isles for the Epoch January 1, 1915. By George W. 
Walker, A.E.C.Sc., M.A., F.E.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 issmd separately :— 
A Eeport on Magnetic Disturbances in Northamptonshire and Leicestershire and their Eelationa 
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. Qd. 
Tidal Friction in the Irish Sea. By G. I. Taylor, M.A. Pp. 33. Price 3s. Qd. 
Electromagnetic Integrals. By Sir G. Greenhill, F.E.S. Pp. 31. Price 3s. 
Bakeeian Lecture, 1918.—Experiments on the Artificial Production of Diamond. By 
The Hon. Sir CHARLES Algernon Parsons, K.C.B., F.E.S. Pp. 41. Price 4s. &d. 
The Pressure upon the Poles of the Electric Arc. By W. G. Duefield, D.Sc., Professor of 
Physics, Captain, Eoyal Air Force, Tiios. H. Burnham, B.Sci, and A. H. Davis, B.Sc., Post- 
Graduate Students in Physics, University College, Eeading. Pp. 28. Price 3s. 
Series B. — Biological. 
The Structure, Evolution and Origin of the Amphibia.—The “ Orders ” Eachitomi and 
Stereospondyli. By D. M. S. Watson, Lecturer in Vertebrate Palaeontology in University 
College, London. Pp. 73 ; 2 Plates. Price 7s. 6c^. 
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, Eothampsted Experimental Station, Harpenden. Pp. 106; 8 Plates. 
Price 12s. 6d 
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. 
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. 
Eecherches Anatomo-CUniques sur les N4vromes d’Amputations Douloureux. Nouvelles 
Contributions a TJEtude , de la E4g4n^ration Nerveuses et du Neurotropisme. Par le 
Prof. G. Marinesco (Bucarest), Membre Correspondant de I’Acad^mie de M^decine de Paris; 
Membre de I’Acad^mie Eoumaine, etc. (Travail du Laboratoire de Eecherches Pathologiques, 
F.C.C. Maudsley Hospital.) Pp. 76 ; 36 Plates. Price 10s. 6d. 
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.E.C.S. Pp. 16 ; 2 Plates. 
Price 3s. 6d. 
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. 
