DIN 6 
Differential calculus, on the first 
principles of, T. Strong, xlv, 
269. 
equations of the second order, 
integration of, xli, 273. 
Dikes, observed to have a crescent 
shape in Connecticut, J. G. Per- 
cival, xlvi, 205. 
of trap, cause of crescent 
form, H. D. Rogers, xlv, 334. 
, in the Connecticut val- 
ley, vi, 47, 56.f 
, of Maine, of four dif- 
ferent ages, C. T. Jackson, xxxvl, 
145. 
, in Massachusetts, near 
Lowell, and at Nahant, &c., 
XXvll, 342. 
, in Michigan, D. Hough- 
ton, xli, 184. 
, in granite, New Hamp- 
shire, numerous, O. P. Hubbard, 
xxxiv, 105.f 
Rowan, N. C, xiv, 242. 
, in Montgomery, Vt., 
xxii, 189. : 
, connection of, with th 
iron ores of Essex Co., N. Y., 
EE. Emmons, x\, 81. 
, effect on limestone, 
xxix, 351. 
, action on mica slate, 
Xxvil, 343. 
of porphyry in Nova Scotia, 
xv, 203, 213. 
Dilatation of gases, V. Regnault, 
xliv, 63. 
Diluvial action, in Sullivan Co., N. 
Y., facts relating to, W. 
Thompson, xxiii, 248. 
scratches, see Scratches. 
Dimorphism, viil, 378 ; xlvi, 370. 
Dinornis, notice of, G. A. Mantell, 
xlv, 184, 188. 
; , and on the Ornithich- 
nites, R. Owen, xlv, 185; xlviui, 
194. 
or natural walls, of| 
8 DIV 
|Diophantine problems, solutions of 
two, T. Strong, xxxi, 156. 
Dioptase, analysis of, Damour, xlvil, 
216. 
Dip, magnetic, daily variation in, 
M. Kupffer, xxv, 194. 
—_, , in different regions, T. 
H. Perry, xvii, 84. 
, at St. Petersburg, xxi, 
9 
382. 
b) 
380. 
,in the U. States, xl, 
, ibid, J. Locke, xxxix, 
319; xl, 149; xli, 15. 
—-, , ibid, E. Loomis, xxxiv, 
290f; xxxix, 41‘; xlili, 93. 
: , at Baltimore, J. Locke 
and JVicollet, xlii, 238. 
5 , at Baltimore and Phil- 
adelphia, A. D. Bache, xl, 375. 
, at Nantucket, Mass., 
hell, xlvi, 157. 
—, , in Ohio and Michigan, 
E. Loomis, xxxviii, 397. 
Diplomatic cipher, new, iv, 377. 
Dipping compass, on the manipula- 
tions of, J. Locke, xlii, 235. 
needle, theory of adjusting, 
TT. Hi Perry xxxvilp2 a 
, see Magnetic Needle. 
Dipyre, xlvil, 417. 
Disease among shell fish, S. P. 
Hildreth, xxxii, 97.£ 
Disinfection by means of alkaline 
chlorides, xiii, 169. 
of alcohol, xii, 174. 
Disintegration of the dolomites of 
the Tyrol, Daubeny, xlii, 321. 
Dislocations, lines of, in Devonshire, 
De la Beche, xxxi, 354. 
of strata in the U. States, E. 
Hitchcock, xli, 268. 
Diving bell, descents in, at Ports- 
mouth, N. H., J. Alden, xxii, 
325. 
W. Mitc 
, heat during descent in, 
xxv, 196. 
Divining rod, iii, 102; xi, 201-f 
, bearing of, on the subject of 
fossil footprints, xlviii, 199. 
Dinotherium, R. Harlan, xli, 178. 
Divisibility of a finite quantity of 
matter, on the infinite, S. Clark, 
ix, 396. 
