[ «* ] 

 LXVIII. Proceedings of Learned Societies. 



ROYAL SOCIETY. 



Nov. 18. — THHE Croonian lecture, by Sir E. Home, bart, 

 -*■ V.P. R.S. was read : it related to the discovery 

 of nerves on both the fcetal and the maternal surface of the pla- 

 centa. And a paper by the same author was also read, On the 

 changes undergone by the Ovum of the Frog, during the for- 

 mation of the Tadpole. 



Nov. 25. — A paper was read, On a method of calculating 

 the angles of crystals, by W. Whewell, M.A. F.R.S. and 

 Fellow of Trinity College, Cambridge. 



LINNjEAN SOCIETY. 



The Linnaean Society resumed its sittings for the season on 

 the 2d of November, A. B. Lambert, esq. V. P. in the chair. 

 Read a letter from Mr. J. D. C. Sowerby to Mr. R. Taylor, 

 giving an account of some specimens of a fresh-water shell, 

 probably the Mytilus polymorphus, found by Mr. Bryant plen- 

 tifully attached to timber in the Commercial Docks. It 

 is found in the Danube, whence probably it may have been 

 brought here in timber. 



A Description of three Species of British Birds; two of them 

 new to the ornithology of the British Islands. By N. A. Vi- 

 gors, Jun., Esq. A.M. F.L.S. The species are: 1, Anthus 

 Richardi, Viellot ; Fam. Sylviadae, Vigurs. Two specimens 

 of it were taken in 1810 and 1812 at Kingsland near London. 

 2, An undescribed species of Scolopax shot in Queen's County 

 in August 1822, and named Scolopax Sabini. 3, Qiierqucdula 

 glocitans. 



A Description of Cowa?iia, a new genus of plants, and of a 

 new species of Sieversia. By Mr. David Don, Libr. L.S. 



These two remarkable plants of the family of Rosacea? are 

 from a large Mexican collection, part of the Herbarium of 

 Mocinno and Sesse, now in Mr. Lambert's possession. 



Cowcmia. Char, essent. Cal. 5-fidus. Petala 5. Ovaria 5-7, 

 ovulo erecto. Styli teminales, continui. Achenia stylis plu- 

 mosis persistentibus aristata. Embryo erectus. 



Sieversia paradoxa foliis fasciculatis lincaribus obtusis sessi- 

 libus integris 3 — 5-fidisve, floribus subcorymbosis, stylis plu- 

 mosis, caule fruticoso. 



Nov. 16. — A. B. Lambert, Esq. V.P. in the chair: among 

 the visitors were Prince Gemitelli and General Turner. Read 

 a letter from John Atkinson, Esq. F.L.S. of Leeds, to A. 

 MacLeay, Esq. Sec. L.S., accompanying some specimens of 

 Beetles found in abundance in an Egyptian mummy in the 

 museum at Leeds. 



Description 



