CONTENTS. 



Page 

 Art. I. Analysis of Professor Ehrenberg's Researches on the 

 Infusoria. By Meredith Gairdner, M. D. Com- 

 municated by the Author, - - 201 

 II. Plan for'Cooling Rooms, and Ventilating them in Tro- 

 pical Climates, By Captain Robert Wauchope, 

 R. N. Communicated by the Author. Plate III. 

 Fig. 1. ----- 225 



III. On the Mountain-chains and Volcanoes of Central 



Asia, with a Map of Chains of Mountains and Vol- 

 canoes of Central Asia. By M. De Humboldt. 

 (With a Map), - - - . 227 



IV. On the Ripple Marks made by the Waves, observable 



in the Sandstone Strata of Sussex. By Gideon 

 Mantell, Esq. F. R. S., F. L. S., &c. - 240 



V. Progress of Geology, — 



AVerner, according to Cuvier, Lyell, and MacCulloch, 247 

 Hutton, according to Playfair and MacCulloch, - 257 



Antiquity of the Eavth, ... - 266 



VI. On the Discovery of Diamonds in the Uralian Moun- 



tains, ----- 267 



VII. On the Characters and Affinities of certain Genera, 



chiefly belonging to the Flora Peruviana. By Mr 

 David Don, Librarian of the Linnean Society; 

 Member of the Imperial Academy Naturae Curioso- 

 sorum ; of the Royal Botanical Society of Ratisbon : 

 .and of the Wernerian Society of Edinburgh, &c. 

 (Continued from p. 228. of former Volume), 271 



VIII. Account of a Wooden Suspension-Dial used in the 

 Alps and Pyrenees. By Owen Stanley, Esq. R.N. 

 Plate Til. Fig.2. Communicated by the Author, 281 



