PUBLICATIONS OF THE ROYAL SOCIETY, 



BURLINGTON HOUSE, LONDON' W. 



Published by Henry Frowde, at the Oxford University Press, Amen Corner, 



London, E.G. 

 Impl. 4to. Price 3 guineas. 

 THE SIGNATURES IN THE FIRST JOURNAL-BOOK AND THE CHARTER- 

 BOOK OF THE ROYAL SOCIETY, being a Facsimile of the Signatures of the Founders, Patrons, and Fellows 

 of the Society from the Year 1660 down to the Present Time. A reduction of price to Fellows of the Society. 



Crown 4to. 483 pages. Price i^s. 

 THE RECORD OF THE ROYAL SOCIETY OF LONDON. Third Edition, entirely 



revised and rearranged. A reduction of price to Fellows of the Society. 



Crown 4to. 455 pages. Price 15^. 

 CATALOGUE OF THE PERIODICAL PUBLICATIONS IN THE LIBRARY OF 



THE ROYAL SOCIETY, 1912. A reduction of price to Fellows of the Society. 



Crown 4to. 128 pages. Price 5^. 

 THE CELEBRATION OF THE 2Soth ANNIVERSARY OF THE ROYAL SOCIETY 



OF LONDON, JULY 15-19, 1912. A reduction of price to Fellows of the Society. 



CATALOGUE OF SCIENTIFIC PAPERS, 1884— 1900. 



Now Ready. Vol. XIII. A to Bzowski. Cloth, ^os. net. Half morocco, 60s. net. 



Vol. XIV. C to Fittig. Cloth, 5or. net. Half morocco, 6oj. net. 

 Vol. XV. Fitting to Hyslop. Cloth, 50^. net. Half morocco, 60s. net. 

 Vol. XVI. I to Marbut. Cloth, $os. net. Half morocco, 60s. net. 

 Published at the Cambridge University Press, Fetter Lane, London, E.G. 



A GENERAL INDEX (under Authors' Names) to the ' Proceedings of the Royal SociExy. 



Vols. 1—75. Covering the Period 1800—1905. Price 5s. Half price to Fellows of the Society. 



REPORT ON THE PEARL OYSTER FISHERIES OF THE GULF OF MANAAR. 



By W. A. Herdman, f.r.s. With Supplementary Reports by other Naturalists upon the Marine Biology. 

 Ito, cloth boards. 5 Parts, 1903 — 1906. Price per Part, 20^. ; to Fellows, 15s. 



REPORTS OF THE SLEEPING SICKNESS COMMISSION OF THE ROYAL 



SOCIETY. DemySvo. No. I., 1903, Price 7^. 6rf. No. II., 1903, Price 7f. Sif. No. III., 1903, Price 6x. No. IV., 

 1903, Price 6s. Bd. No. V., 1905, Price Is. No. VI., 1905, Price 4s. &d. No. VII., 1906, Price 4j. 6rf. No. VIII., 

 1907, Price 2j. 6i^. No. IX., 1908, Price Is. 6^/. No. X., 1910, Price 3s. No. XL, 1911, 7s. No. XII., 1912, &*. 

 No. XIIL, 1913, 2s. 6;/. No. XIV., 1913, 2s. 6(^. No. XV., 1914, 3s. 6rf. No. XVL, 1915, 8j.» 



* Nos. VI.— XVI., Published by H.M. Stationery Office, Imperial House, Kikgsway, W.C. 



REPORTS OF THE COMMISSION ON MEDITERRANEAN FEVER. 8vo. 



Part I., 1905, Price 3s. Part II., 1905, Price 2s. Part III., 1905, Price 2s. 6d. Part IV., 1906, Price Is. 6rf, 

 Part v., 1907, Price 2s. Bd. Part VI., 1907, Price 3s. Part VII., 1907, Price 5s. 



REPORTS TO THE EVOLUTION COMMITTEE OF THE ROYAL SOCIETY. 



Demy 8vo. 



Report 1. By W. Bateson, m.a., f.r.s., and Miss Saunders. Pp. 160. 1902. Price 10s. 



Report 2. By W. Bateson, m.a., f.r.s.. Miss Saunders, R. C. Punnett, m.a., 



and C. C. Hurst, f.l.s. Pp. 154. 1905. Price 7i. 6d. 



Report 3. By W. Bateson, m.a., f.r.s.. Miss E. R. Saunders, and 



R. C. Punnett, m.a. Pp. 53. 1906. Price Zs. 6d. 



Report 4. By the same, with Miss Durham, L. Doncaster, etc. Pp. 60. 1908. Price 2s. Sd. 



Report 5 (concluding). By M. Wheldale, D. C. E. Marrvat, and I. B. J. Sollas. 



Pp. 79. ^' y ■> igo9_ Price Zs. 



Title page. Contents, and Index to above 5 Reports. _ Price 6d. 



The 5 Reports may also be obtained bound complete in one volume. Price 20s. 



Contents of PROCEEDINGS, No. A 672. May, 1919. 



Price 5s. 6d. 



Page 



ON THE ARC SPECTRUM OF SCANDIUM. By Sir William Crookes, CM. , 



D.Sc, F.R.S. (Plate 11) 438 



VIBRATION AND STRENGTH OF STRUTS AND CONTINUOUS BEAMS 



UNDER END THRUSTS. By W. L. Cowley, A.R.C.Sc, D.I.C, and H. Levy, M.A., B.Sc, F.R.S.E. 440 



TWO-DIMENSIONAL SOLUTIONS OF POISSON'S AND LAPLACE'S 



EQUATIONS.— Part L By Leonard Bairstow, F.R.S., C.B.E., Part II. By Arthur Berry, M.A. 457 



SCATTERING OF LIGHT BY SOLID SUBSTANCES. By the Hon. R. J. Strutt, 



F.R.S. (Plate 12) *76 



A NEW METHOD OF WEIGHING COLLOIDAL PARTICLES. By E. F. 



Burton, Ph.D 480 



THE CONSTITUTION OF SULPHUR VAPOUR. By Sir James J. Dobbie, 



F.R.S., and J. J. Fox, M.B.E., D.Sc. (Plates 13 and 14) 484 



OBITUARY NOTICES OF FELLOWS DECEASED :— Bertram Hopkinson 



(with portrait) XXVi— XXXVi 



Published by Harrison & Sons, 44—47, St. Martin's Lane, London, W.C. 2. 



