406 INDEX. 



Chloride of nitrogeOj 155 Chlorine, a remedy in phthisis, 161 

 Classification of rocks, 26 Clemson, W. G. on piperin,352 Coal, origin of, 321 

 Collections of New England rocks for sale, 390 Coloring materials in Canada, 186 

 Coloring matter in Lichen rocella, 151 Conversation on animal economy, 203 

 Conversations on vegetable physiology, 204 Correction for Vol. xvii.p. 390 

 Cyanogen, compounds of, 329 



Darlington, Dr. on Cardamine rotundifolia, 356 



Dearborn, Gen. translation of a French paper on springs and fountains, 267 



Deweylite, a new mineral, 81 Dew point, 63 



Doebereiner, researches on platina by, 151 Domestic architecture, 232 



Drowned persons, 170 



Eaton, Prof, on gold formation of U. S. 50 Editor, on anthracite region of Penn. 308 

 Ellet, Dr. W. H. on cyanogen and compounds, 329 Ellipse, on rectification of, 38 

 Elliott, Stephen, death of 390 

 Emmet, Prof, a new test for arsenic by, 58 



, on the solvent powers of ammoniacal salfs, 255 



Emmons, Dr. E. on the heating of water, 371 



• on the temperature of the sea, 192 Encyclopedia Americana, 202 



Equations of fourth degree, 276, 308 Equivalents, circular scale of, 196 

 European rocks, classification of, 26 



F. 



Fell, Judge, on early use of anthracite coal, 308 Ferrocyanate of potassa> 331 

 Ferrocyanic acid, 330 Ferruginous sand formation, 243 

 Field, Gen. M., Meteorological table by, 366 

 Feuchtwanger, Dr. L. account of new minerals by, 391 



irised Aurora borealis, 393 



Finch. J. on circular scale of equivalents, &c. 196 



Firemen, preservation of against flame, 177 Flesh of young calves, 400 i 



Fluxions, solution of a problem in, 67 Foster, B. F. on practical penmanship, ^5 



Fountains, in architecture, 230 Fountains, natural, of fresh water, 379 



Franconia iron works, 134, 289 Franconia minerals, 128 



Fryeburg beryls, 290 Fulminating silver, 155 



Galvanic currents, 199 Garnets of Hanover, 126 



Genesee river, upper falls of, 209 Geological specimens for sale, 390, 394 



Geology of the Cataraqui, 85 Geology of the coal region of Peru, 308 



Kingston, (U. C.) 104 Georgia meteorite, 388 



Gold formation of the U. States, 50 Gold in the Ural Mountains, 190 

 Gothic style of architecture, 220 Greece, ancient and modern, 250 

 Green, Wm. on vegetable coloring materials, 186 

 Griscom, Prof, notices from foreign journals by, 145, 394 



H. 



Hail storms, the causes and phenomena of, 1 

 Hayes, A. A. on bromine in Saratoga waters, 142 



on the dew point, 63 



Heidelberg geological specimens, opinion of, 394 



Helvetic Society of Nat. Hist. 168 Hildreth, Dr. S. P, on American cicada, 47 



Hildreth, Dr. S. P. meteorological observations by, 368 



Homergue's essays on silk, 382 Hopkins, Lieut, on sesqui-sulphate of mercury, 364 



Howe, Dr. S. G. on Greece, 250 Hydriodate of potassa^a test for arsenic, 58 



Hydriodic ether, 161 Hydro-bromic acid and potassa in Saratoga waters, 142 



Hydro-carbon, new mineral, 164 



Hydrocyanic acid, effect of on muriatic and sulphuric acids, 146 

 — , 157 under peculiar circumstances, 201 



I. 



Ice, artificial preparation of, 145 Indian summer, cause of, 66 

 Indigo, manufacture of in U. S. 237 Iodide of potassium, a test for arsenic, 58 

 Iodine, crystalline form of, 84 loduret of azote, preparation of, 354 ^^ 



Ircm, silicate of, 164 Iron works of Franconia, 134, 289 Iron works of Sweden, 173 



