CONTENTS. 



Page 

 in the course of the River Tay. By Charles 

 Maclaren, Esq., F.R.S.E., . . 278 



VI. Report of the Researches of M. Agassiz during 

 histwo last sojourns at L'Hotel-des-Neucha- 

 telois, upon the Lower Glacier of the Aar, 

 in the years 1841 and 1842. By M. E. 

 Desor. Continued from page 178, . 290 



1. Experiments on Infiltration, . . .290 



2. On the Blue Bands, or those of Infiltration, . 296 



3. On Stratification, .... 304 



4. Observations on the pretended Purity of Ice, . 311 



VII. On the Composition of Avanturine-Glass. By 



Professor F. Wohler, . . . 313 



VIII. On the Forms assumed by Granite and Gneiss 

 at the surface of the Earth. By Baron 

 Leopold. Von Buck, . . . 316 



IX. The Cells in the Ovum compared with Cor- 

 puscles of the Blood — On the difference in 

 Size of the Blood-corpuscles in different 

 Animals. By Martin Barry, M.D., 

 F.R.SS. L. andE., . . .320 



X. On the Comparative Level of Lakes and Seas, 

 as the Caspian, Lake Aral, Black Sea, Red 

 Sea, Mediterranean, Lake Tiberias, Dead 

 Sea, Atlantic, Pacific, &c. By Baron 

 Alexander von Humboldt, . . 323 



XI. The genus Cetochilus, belonging- to the order 

 Copepoda and the family Pontia of M. Ed- 

 wards. By Henry D. S. Goodsir, Esq., 

 Conservator of the Museum of the Royal 

 College of Surgeons, Edinburgh. Commu- 

 nicated by the Author, with Plate. Con- 

 tinued from p. 104, . ^ . 336 



Betochilus Septentrionalis, . . . 336 

 Sect. IV. — On a new Genus and Species of Crusta- 

 cean, ..... 337 

 Genus Irenaeus (Mihi) . . . 337 

 Irenaeus splendidus (Mihi) , . , 333 



