INDEX. 



Thomas, D. on frogs in stone, 167. 



on physical climate, 361. 



• on coal measures in N. Y.326. 



Thomson, Dr. his analysis of anthophyl- 



lite, 359. 

 Thunder storms, cause of, 277. 



, in France, 191. 



Trade wind, causes of, 266. 

 Transactions of Albany Institute, 173. 



u. 



Ulmus, new species of, 169. 

 V. 



Vapor, force of at different temperatures, 



201. 

 Vapor, the basis of the aurora borealis, 240. 

 Vegetable Chemistry, 380. 



crystallizations, 177. 



Vegetable physiology, 393. 

 Vinci, Leonardi da, on the motion of wa- 

 ter, 397. 

 Vinegar, impurities in, 86. 

 Volatile oils, adulteration of, 77. 

 Voltaic electricity, theory of, 178. 



w. 



Water cresses, 191. 



Water, decomposition of, 383. 



in red hot vessels, 381. 



Winds, proximate causes of, 248. 

 Woodbridge, C. annals of education by, 



357. 

 Woodruff J. on the barn swallow, 172. 



z. 



Zinc, acted upon by sulphuric acid, 372. 



