@ DN 
Crystals of topaz, distribution of col- 
oring matter in, and optical prop- 
erties of, vil, 364. 
of zircon, tesselated, J. D. 
Dana, x\vi, 36.f 
Crystalline forms, two, presented 
by the same substance, vii, 
378 ; xlvi, 370. 
substances from the juice of 
plants, xi, 391. 
Crystallization, tendency to, in mat- 
ter, xix, 381. 
, on the influence of air on, 
M. Graham, xvii, 373. 
effected by the action of 
weak electric forces, M. Becque- 
rel, xvii, 8833 xxvili, 291. 
ibid, G. Bird, xxxiii, 
267. 
—_ - —— —_,, A. Crosse, xxxv, 
125.f 
, an instance of instantaneous, 
J. Green, iil, 93. 
of snow, J. Green, ii, 837.f 
, curved, of gypsum; Mam- 
moth Cave, Ky., J. Locke, xlii, 
206.f 
the cause of the schistos 
structure and cleavage of some 
rocks, J. D. Dana, xlv, 105. 
of carbonate of potash, vill, 
181. 
of the carburets, S. Brown, 
xxxvill, 118. 
of oil of sassafras, remarka- 
ble, A. A. Hayes, xx, 128. 
of water, light from, xxvi, 
178. 
Cuba, coal mines in, J. H. Blake, 
xlii, 388. 
, fossils of, supposed to be 
oolitic, J. Lea, xl, 41. 
, meteorological observations 
in, J. H. Blake, xlii, 292. 
Culmites, vil, 180. 
Cummingtonite, named and describ- 
ed, C. Dewey, viii, 59. 
, locality in Massachusetts, viil, 
233; ix, 43, 54. 
62 
cus 
Cupellation, new method of, W. W. 
Mather, xxxv, 321. 
,a mode of, G. Engelmann, 
xlii, 394. 
Currents in water, remarks on the 
causes of, A. W. Carson, xxix, 
340.f 
—,a fact relating to, C. 
Rumker, xx, 180. 
, evidences of them over 
the surface of the earth, xi, 100. 
» oceanic, v, 132. 
oh , and temperature, xxv, 
130. Ey 
3 —, from the north polar 
regions in the Atlantic, Wm. 
C. Redfield, xxxii, 349; xviii, 
373.f 
-—, , ibid, ice boulders and 
pebbles, transported by, xxxil, 
351; xlvili, 373.f 
a » ibid, influence of, on 
the Gulf Stream, W. C. Redfield, 
xlvii, 381. 
4 , Gulf Stream, its limits 
and relation to the north polar 
current, W. C. Redfield, xxxii, 
349; xlvilil, 381. 
—, ,of the Atlantic, iv, 
390. 
> ——, —., W. C. Redfield, 
xiv, 295. 
i 4 , causes of, and 
influence in producing the sed- 
imentary rocks of the United 
States, W. W. Mather, xlix, 1. 
of the Southern and Pacific 
oceans, xlv, 299. 
, atmospheric, see Winds. 
Curtis, M. A., new and rare plants 
of N. Carolina, xliv, 80. 
, botanical labors of, xlii, 12. 
Curves for arches, method of. de- 
scribing, J. Thomson, xxiv, 73.! 
of conic sections, instruments 
for drawing, xv, 368.f 
of tri-section, W. Allen, iv, 
343.f 
Cunningham, R., obituary notice of, 
XXX, 215. 
Cuscutineee, monograph of North 
American, G. Engelmann, xliu, 
333!; xlv, 73.f 
