GUA 
Greenstone, degradation of, vi, 55. 
, dikes of, Connecticut valley, 
vi, 47, 56. 
, see further under Trap. 
Greek conjugations, J. W. Gibbs, 
xxxvil, 112. 
correlatives, J. W. Gibbs, 
XXXIV, 337. 
fire, J. Cutbush on, vi, 302. 
verbal roots in English, J. W. 
Gibbs, xlv, 284. 
Grevilleanum serratum, xi, 183.f 
Greystone, characters of, xv, 32. 
Griffith, Mary, on the halo which 
surrounds all bodies, xxxvill, 22. 
Grindstones of Nova Scotia, xv, 
148 ; xxx, 338. 
Griscom, J., on botanical fétes in 
France, ix, 154. 
Griswold, C., submarine explosion, 
ii, 94. ; 
Gronovius, J. F., letters from, to C. 
Colden, xliv, 85. 
Grooves in rocks, see Scratches. 
Grotto del Cane, xxiv, 244. 
Grove’s voltaic battery, xxxvill, 116. 
, experiments with, 
S. F. B. Morse, xlv, 390.f 
, on the use of car- 
bon in, B. Silliman,.Jr., xliil, 
393; xliv, 180.f 
Groves of evergreens, their value, 
near gardens, &c., xxii, 158. 
Growth of wheat, on the accelera-| 
tion of, G. W. Hall, xxxi, 345. 
of timber, xxiv, 391. 
Guaco, notice of, xxii, 182. 
, medical virtues of, confirm- 
ed, W. R. Johnson, xxvii, 171. 
, remedy for hydrophobia, W. 
R. Johnson, xxiv, 279. 
» Dote on, xxiv, 388. 
Guadaloupe fossil human skeleton, 
description of the skull of, JJ. 
Moultrie, xxxii, 361. 
Guano, remarks on, J. E. Tesche- 
macher, xlvi, 203. 
» account and analysis of, 
xlviil, 181. 
, change in bones in, R. War- 
rington, xlix, 391. 
113 
GUT 
Guano, xanthic oxide in, xlix, 200. 
, xanthine in, Unger, xlix, 391. 
Guillemin, J. B. A., on the bitter- 
ness of vegetables, xxiv, 273. 
Gulf of Mexico, accumulation of 
water in, supposed from the ac- 
tion of the Gulf Stream, v. 353. 
Gulf Stream, cause of, v, 353. 
——., existence of, determin- 
ed by B. Franklin, xlvii, 162. 
—— ——, supposed connection 
of, with opposite currents on the 
coast of the United States, W. C. 
Redfield, xxxii, 349. 
, extent of, xxxil, 350. 
—— ——,, ice of the north brought 
within the dissolving influence of, 
on the Newfoundland bank, W. 
C. Redfield, xxxii, 351. 
, loss. of vessels in, xx, 
——= 
158. 
» remarks on, MM. F. 
Maury, -x\vii, 161. 
Gum, composition of, xxii, 350. 
ammoniacum, xx, 399. 
‘Gun barrels, browning of, xxxiv, 45. 
Gunpowder, A. Ure on the composi- 
tion of, xx, 190. 
,experiments on, A. Mordecai, 
xlix, 180. 
,inflamed under water, xxii,354, 
——, method of augmenting the 
force of, Geo. Gibbs, i, 87. 
, safe process for manufactur- 
ing, S. Guthrie, xxi, 292. 
Guthrie, S., mode of obtaining chlo- 
ric ether, xxi, 64; xxii, 105. 
, chemical products by, xxi, 92. 
, fFulminating preparations, xxi, 
288, 293. 
, gunpowder, safe process, xxI, 
292. 
——., molasses from the potato, xxi, 
93. 
, sugar from potato starch, xxi, 
284. 
, purification of turpentine, xxi, 
Oe 
——,, pure oil of turpentine, xxi, 93. 
——, vaporization of mercury in 
the fumes of nitric ether, xxi, 90. 
