INDEX TO VOL. 11. 



N. B. New genera and species are in Italics. 



A. 



Abbot, J. H. Facts in electricity, 252. New experiment in Hy- 



draulics, 265, On the tornado of Middlesex County, 285, 292. 

 Acanthosoma, gen., Owen, 217. 

 Acartia, gen., Dana, 10, 25. 

 laxa, D., 26. 

 limpida, D., 26. 

 negligens, D., 26. 

 tonsa, D., 26. 

 Africa, configuration of, 265. 



Agassiz, L. On the fossil Cetacea of the United States, 4. Investi- 

 gations upon Medusae, 148. On the development of ova in insects, 

 181. On the egg, in Vertebrata, as a means of classification, 183. 

 On the coloration of animals, 234. On the diversified functions of 

 cells, 236. On the structure of the egg, 237. On Siluridre, 238. 

 On the scales of the Bonito, 238. On the Florida coral reefs, 262. 

 On the Mansfield coal formation, 270. On the foundation of sym- 

 metry throughout the animal kingdom, 323. 

 Agatea, gen.. Gray, 323. 



violaris, Gray, 324. 

 Air, influence of, in the action of water upon lead, 86. 

 Alcohol, importance of, for light, 319, 322. 

 Aldebaran, occultation of, 258. 



Alger, Francis. On crystals of gold from California, 246. On 

 Sigillaria, 263. 



