INDEX. 



331 



Hare, Dr., on the climate of the Atlantic 

 states; on the trade winds; and on 

 electricity as a principal instrument 

 in the production of storms, 187. 



on the congelation of water by the 



evaporation of ether, &c. 156. 



engraving and description of an ap- 

 paratus and process for the rapid con- 

 gelation of water, &c, 198, 213. 



on the electricity of the- animal 



body, 324. 



on the electricity of a jet of steam, 



&c, 324. 



on the extent to which the galvanic 



influence can extend through a coil of 

 wire, 199. 



— on a liquid and gaseous ethereal 



compound, resulting from the reaction 

 of nascent hyponitrous acid on alco- 

 hol, 251, 270. 



on Prof. Loomis's views of storms, 



193. 



obtains brilliant metallic spangles 



of calcium, 83. 



on the change effected in the ni- 

 trates of potash and soda, by the limit- 

 ed application of heat, with a view to 

 obtain pure oxygen, 251, 270. 



on the method of obtaining oxygen 



from nitre, 139. 



exhibits a specimen of pure plati- 

 num, freed from iridium, 14. 



exhibits a mass of fused platinum 



between 22 and 23 ounces in weight, 

 42. 



describes a specimen of potassium, 



in the globular form, assumed by fall- 

 ing into naphtha, 166. 



on certain products from the for- 

 mation of hyponitrous ether, &c, 176. 



on the application of radiant heat 



to glass, 159. 



results of experiments on the rare- 

 faction of moist and dry air, 200. 



on anew mode of procuring silicon, 



175. 



on the tornado at Philadelphia, Ju- 

 ly 13, 1840, 256. 



on a tornado at Providence, R. 1. 



48, 58. 



remarks on a tornado at Somerset, 



Mass., 42. 



on tornadoes and the .electrical 



theory of their formation, 122. 



— — — presents copies of a French trans- 

 lation of his communication on the 

 subject of tornadoes, 236. 



on an extensive voltaic apparatus, 



constructed under his direction for 

 the Lowell Institution, 253. 



Mr. Clark, on the perchlorate of 



ethule, 261, 319. 



Harris, Mr. Levett, his death announced, 

 149. 



F 



Hays, Dr., appointed to prepare an obi- 

 tuary notice of Mr. Keating, 234. 



remarks on two animals in the 



museum of Mr. Koch, of St. Louis, 283. 



on the catoptric examination of the 



eye, 97, 102. 



on entozoa in the eye, and else- 

 where, 209. 



relates a case of cerebral disease, 



with loss of the power of distinguish- 

 ing colours, 104. 



on the inability to distinguish cer- 

 tain colours, 265. 



on a case of perverted vision, in 



which all perpendicular lines appear- 

 ed double, whilst horizontal ones were 

 seen accurately, 156. 



presents a table of the peculiarities 



of those not able to distinguish co- 

 lours, 117. 



i on the operation recently devised 



for strabismus, and its effects on vi- 

 sion, 273. 



on a new vaccine virus, 90. 



Heckewelder, Mr., MS. of words in the 



Lennape language, 271. 

 Henry, Prof., announces, from ordinary 

 electricity, currents by induction, 

 &c, 14. 



announces the discovery of two 



distinct kinds of dynamic induction 

 by a galvanic current, 135. 



on the development of electricity 



during combustion, &c, 324. 



on the electricity of a jet of steam, 



322. 



papers on electro-dynamic induc- 

 tion, 54, 64, 233, 299, 315. 



on electro-dynamic induction, mag- 

 netic distribution, &c. 233. 



on an electro-magnetic machine 



invented by him, 301. 



on a galvanic apparatus for produc- 

 ing reciprocating motion, 301. 



on the lateral discharge of electri- 

 city, &c. 6. 



on a phenomenon of capillary ac- 

 tion, 82. 



Hessian fly, Miss Morris, on the, 282, 

 318. 



Hewson, Dr. T., meteorological journal 

 of, report of committee on the, 104. 



Historical committee announce the pub- 

 lication of Mr. Du Ponceau's Disser- 

 tation on the Chinese system of wri- 

 ting, 7. 



report of the, 247. 



Hopkinson, Judge, deposits the log-book 



of the first steam vessel across the 



Atlantic, 193. 

 on a presumed earthquake, Nov. 14, 



1840, 301. 

 Horner, Dr., on a fancied earthquake, 



Nov. 14, 1840, 301. 



