416 



INDEX. 



Tubular cavities in the chalk, 122. 



Twilight bow, 389. 



Twining, Prof. A. C, on Aurora borealis 



of Sept. 3, 1839, 376. 

 Tyrian dye, 126. 



V. 



Vegetable organography and physiology, 



49. 

 Vegetables, fossil, structure of, 126. 

 Virus, vaccine, liable to lose its virtue, 



175. 

 Vocabulary of Gissi or Kissi language 

 41. 



Mendi language, 45. 

 Vai language, 43. 

 Voltaic battery of extraordinary power, 

 116. 



circle, theory of, 117. 



W. 



Ward, C. J., exchanges of shells, 205. 

 Water of British Channel analyzed, 12. 

 decomposition and recomposition 

 of, 336. 



Waves, determination of their laws, 100. 



Wax tablet used in instructing the'blind, 

 186. 



Webster, Prof. J. W., notice of his Man- 

 ual of Chemistry, 329. 



Weights, atomic, of elementary bodies, 

 119. 



Whales, remains of, found at Durham, 

 Eng., 130. 



Wheat, its growth accelerated, 129. 



Wilkes, Lt. C, account of exploring ex- 

 pedition, 387. 



Woody tissue, formation of, 128. 



Wool, new species of, introduced into 

 Britain, 132. 



Wyman, Dr. J., dissection of mackerel 

 shark, 197. 



electrical 

 eel, 197. 



abstract of proceedings 

 of Boston Nat. Hist. Soc, 193, 391. 



Zeuglodon, geognostic position of, 381. 

 Zoological researches in the Orkneys, 



128. 



