COIS TENTS. 



Art. I. Memoir of the late D. F. Gregory, M.A., 

 Fellow of Trinity College, Cambridge. By 

 R. Leslie Ellis, Esq., Fellow of Trinity 

 College, Cambridge. Communicated by 

 Dr Alison, F.R.S. Ed., &c. &c., . 223 



II. Sixth Letter on Glaciers. Addressed to the 

 Right Honourable Earl Cathcart. Com- 

 municated by Professor Forbes, . 231 



III. Seventh Letter on Glaciers — On the Veined 



Structure of the Ice. Addressed to the 

 Rev. Dr Whewell, Master of Trinity Col- 

 lege, Cambridge. Communicated by Pro- 

 fessor Forbes, .... 244 



IV. On the Ancient Peruvians. By Dr J. J. de 



TscHUDi, Author of the Fauna Peruviana, 

 &c. &c. Communicated by the Ethnolo- 

 gical Society, .... 249 



V. The Mongols. By Bayle St John, Esq. 

 Communicated by the Ethnological So- 

 ciety, ..... 256 



VI. Description of a Totally Reflecting Prism, 

 employed for illuminating the open Cavi- 

 ties of the Body ; with a view to facilitate 

 the examination of Disease, and the appli- 

 cation of remedial means in such situa- 

 tions; illustrated with an Ear " Specu- 



