IR oO 
Iron, argillaceous, in Delaware, xiv, 
11. 
—-, , in Canada, viii, ‘76. 
, carbonate of, or spathie, in 
New Hampshire, vi, 245. 
‘ , in Vermont, Plymouth, 
ix, 22; xxiv, 170, (with ana- 
lysis. ) 
‘ ; in Massachusetts, v, 
269; ix, 54; xxii, 50. 
5 , in Connecticut, it, 226 5 
vi, 209; xix, 3116, (New Mil- 
ford) ; xxxiul, 160. 
——, chromic, in Vermont, xxviii, 
383. 
——, ——, in Massachusetts, vi, 
248 ; vill, 56; xxiv, 397. 
——, ——, in Connecticut, vi, 233. 
——, , in New York, ix, 243. 
——, ——, in Pennsylvania, viii, 
239: ix, 45; xiv, ‘7, 10. 
—_, , in Maryland, xxvii, 18. 
, hematite or brown, in Ver- 
mont, ili, 575 iv, 23; v, 249. 
——, ——,in Massachusetts, iv, 
285; v, 269; viii, 55; xxii, 54. 
—., , in R, Island, iv, 285. 
—, , in Connecticut, ii, 209, 
212,216; vi, 208; viii, 260; xix,' 
322; xxxiil, 156. 
—, , in New York, i, 144; 
iv, 47. 
‘ , in Pennsylvania, 1, 236 ; 
xiv, 14. 
, Magnetic, igneous origin in- 
dicated “by jointed structure, xll, 
173. 
5 
, connection with trap 
dikes, E. Emmons, x\, 81. 
——, , at Mount Etna, XXX, 
186. 
,» ——, in New Hampshire, 
xvili, 130. 
» ——, in Vermont, ili, 76 ; vi, 
232. 
: , in Massachusetts, i, 
115, 344; 
255 + viii, 
XXxii, 52. 
; , in Rhode Island, (native 
magnet) iv, 285; v, 402. 
v, 269; vi, 208; vii, 
553 ix, 48 x, 138,18; 
17 
133 I 
R O 
Iron, magnetic, in Connecticut, v, 
41; vili, 259; xxxili, 155; xlvi, 
365, (distorted crystal.) 
—-, , in New York, iv, 483 v, 
28; ix, 41, 252; ssi 350; xl, 
81. 
, in Pennsylvania, vill, 
238 ; xe 219 ; xiv, 10, 18. 
—-, , in Maryland, xviii, 81. 
—, ——., in Canada, viii, 75. 
, micaceous, in Vermont, iil, 
76; vi, 208, 233. 
——, ——,Iin Massachusetts, 1, 
115; iv, 53; vi, 27, 207, 2383, 
248; xxil, 53. 
——, , in Rhode Island, viii, 
231, 232. 
, —, in New York, xxv, 
350. 
‘ , in Pennsylvania, iv, 4; 
vili, 22 
, , in Virginia, ill, 282. 
, phosphate of, Cornwall, anal- 
ysis of, vii, 369. 
pyrites, cause of decomposi- 
tion of, xix, 387. 
, specific gravity of, xix, 
388. 
, occurrence of, in fossil- 
iferous rocks, xxxi, 74. 
, in New Hampshire, 
xviil, 129, 131. 
, In Vermont, 
115; 
1, 
vi, 245. 
, in Massachusetts, viii, 
54; x, 18; xxii, 51. 
, in Rhode Island, viii, 
199. 
, in Connecticut, i, 49; 
v, 44; vil, 56; x, 13; xxxill, 
160. 
——, in New York, v, 12, 
xix, 224; xxv, 350; xxviii, 172; 
xlvi, 36.f 
si lage ais: 
, in Pennsylvania, iv, 
4; viii, 239 ; x, 222; xiv, 5, 6, 
8, 13. 
ew, 1) OHiOSEX Ve on 
poe , in New Jersey, v, 28. 
—— ——,in Maryland,  xviil, 
80. 
