56 Annals of the Philosophical Club 



mathematical studies. In 1856 he made a rather long journey in 

 Eastern Russia, of which he published an account in the following 

 year, and in 1860 visited Croatia and Hungary. His first treatise 

 on Mathematics, Meditationes Analytics, appeared in 1847, but he 

 wrote many papers on contacts of curves and surfaces and the higher 

 branches of analytical geometry, also publishing in 1851 the first 

 elementary treatise in determinants. Twenty years after that he 

 undertook experimental research in physics, at first on the polariza- 

 tion of light, then on electrical discharges in rarified gases, besides 

 which he had an unusual knowledge of languages, European and 

 Oriental. He received honorary degrees from Oxford and Cam- 

 bridge, Edinburgh and Dublin, was elected F.R.S. in 1853, and 

 became President in 1878, but died of a fever on June 27th, 1883, 

 leaving the reputation not only of a brilliant mathematician and 

 physicist, but also of a highly accomplished and singularly attractive 

 man* 



1862. At the Anniversary Meeting on April 28th, no 

 election was made for want of a quorum, which was not 

 obtained till June igth, when Mr. Sclater and Colonel Yorke 

 were elected into the vacancies caused by the resignations 

 of Sir Proby Cautley and Sir J. Herschel. 



DR. PHILIP LUTLEY SCLATER, a member of a Hampshire county 

 family, was born in November, 1829. From Winchester he went 

 to Corpus College, Oxford, where he obtained a First Class in mathe- 

 matics and a Fellowship, but already had begun to collect birds. 

 He was called to the Bar, and for some years went on the Northern 

 circuit, but after making a rather long journey in North America 

 in 1857 and visiting Tunis in 1859, he became in that year Secretary 

 to the Zoological Society, which soon felt the stimulus of his energy. 

 When he resigned in 1902, the number of its Fellows had risen from 

 about 1300 to 3000, new offices had been erected in Hanover Square, 

 and the animals mostly housed in new buildings. He became F.R.S. 

 in 1865, a Ph.D. of Bonn, and an Hon. D.Sc. of his own University, 

 dying on June 27th, 1913, after writing many valuable papers on 

 birds and mammals. His fine collection, containing over 3000 species 

 of certain orders of American birds, is now in the British Museum. 



LT.-COL. PHILIP JAMES YORKE, distinguished as a chemist, was 

 son of a Prebend of Ely and a descendant of the first Lord Hardwicke, 

 born Oct. i3th, 1799. From Harrow School he obtained, about 

 1816, a commission in the Scotch Fusilier Guards, retiring about 

 1852 with the rank of Lieutenant-Colonel. He was President 

 of the Chemical Society, 1853-5, and elected F.R.S. in 1849. His 

 most important researches were on the solution of metallic lead by 

 the action of water, and he made a laborious comparison of the 



