Benes 
Theory of a resisting medium, ex- 
amination of, xxxiil, 1. 
Thermal spring, see Spring. 
Thermo-electricity, xxv, 271; xxx, 
181. 
Thermo-electrical battery, J. Locke, 
xxvi, 214. 
experiments on metals, J. 
Locke, xxvi, 381. 
piles of Nobili, new, xxviii,397. 
Thermo-magnetism, a law of, re- 
garding metals unequally heated, 
&e., J. P. Emmet, xxvi, 311. 
Thermo-multiplier, Nobili and Mel- 
loni, xxii, 370; xxiii, 185. 
, effects of, M. Melloni, xxiii, 
381. 
Thermometer, when invented, ii, 
359. 
——,, theory of the construction of, 
J. Adams, viii, 121. 
, a new mode of graduating, 
Skene, xii, 397. 
, American manufactures of, 
vi, 371. 
, employed in finding the 
heights of mountains, xliv, 12. 
, or apparatus for measuring 
the expansion of solid bodies, W. 
W. Mather, xxx, 324.f 
——,, differential, W. Howard, ii, 
327.f 
Thermometric observations on solar 
and terrestrial radiation, at Mon- 
treal, 1838, J. S. McCord, xxxvi, 
180, 182. 
, see farther under Tem- 
perature and Meteorological. 
Thermopsis caroliniana, xliv, 80. 
—— fraxinifolia, xliv, 81. 
Thermoscope, new, xxii, 370. 
Thermoscopic galvanometer, xxi, 
370; xxxili, 365. 
Thetford, Vermont, copperas facto- 
ry near, ill, 326. 
Thilorier, liquid carbonic acid, 
xxxi, 402. 
, solidification of carbonic acid, 
xxxl, 163, 404. 
Thimbles, manufactory of,in France, 
iil, 375. 
263 
T HO 
Thomaite, a new mineral, xlix, 393. 
Thomas, D., dip of the rocks in 
western New York, xviii, 375. ~ 
, on coal formations in New 
York, xix, 326. 
, on physical climate, xix, 361. 
——, Chrysomela vitivora, xxvi, 
113.f 
——, on the American locust, xxi, 
188. 
, specific characters of two 
species of Corydalis, xxvi, 114.f 
, description of a new UI- 
mus, xix, 170.f 
, on a new species of Liatris, 
xxxvii, 338.f 
, on frogs and toads in rocks, 
xix, 167. 
Thomas, E., improvements in the 
microscope, xix, 57.f 
, improvements in the achro- 
matic microscope, xx, 265.f 
, obituary notice of, xxii, 380. 
Thomas, J., transmission of galyan- 
ic light through metals of differ- 
ent conducting powers, Xxxiv, 
205.f 
| Thompson, W. A., facts relating to 
diluvial action, xxiii, 243. 
, account of marks on gray- 
wacke, xx, 124. 
, on the vitality of toads con- 
fined, xxv, 41. 
Thomson, Sir Benjamin, obituary 
notice of, xix, 28; xxxili, 21. 
Thomson, C., grave of, xxxv, 389. 
Thomson, J., elevation of rails for 
roads of certain curvature, Xxil, 
346.f 
, on inclined planes in the 
construction of railroads, xxiii, 
107. 
, method of describing curves 
for arches, xxiv, 73.f 
Thomson, J. B., Elements of Ge- 
ometry, by, noticed, xlvui, 210. 
Thomson, R. D., on action of emul- 
sin on amygdalin, xxxv, 302. 
, British annual of, noticed, 
xxxvii, 400. 
, on Parietin, xlix, 195. 
