ECL 
Eaton, A., gravel near Troy, v, 22. 
, North American localities, 
showing equivalency of rocks on 
opposite sides of the Atlantic, 
xxxix, 149. 
, cardinal points in stratigraph- 
ical geology, xxi, 199. 
eological equivalents, xxi, 
18 
132. 
4 nomenclature of rocks, 
xiv, 145f, 359. 
——, Prodromus, xvii, 63. 
—-—, gold rock of the south is tal- 
cose slate, xvill, 50. 
F —— of Mexico equiva- 
lent to that of the Carolinas, xx, 
124. 
, Boletus igniarius, analogous 
to animal-substances, vi, 177. 
, Crotalus reliquus, xx, 122.f 
, gases and salts forming near, 
Erie canal, xv, 233. 
, living antediluvial animals, 
xv, 239. 
, number five a favorite in na- 
ture, xvi, 172. 
, magnetic needles, improve- 
ment in manufacture of, xii, 14. 
, trilobites, xxil, 165. 
, notice of new edition of the 
Geological Text Book of, xxii, 
391. 
, remarks by D. Thomas on 
the views of, on the coal forma- 
tions of New York, xix, 326. 
Ebullition by cold, apparatus for 
producing, R. Hare, xxxili, 248.f 
Echinus, see Zootocy, Radiata. 
Echo, in Virginia, C. G. Page, 
xxxvi, 174. 
, in N. York state, J. B. 
Church, xxxvi, 175. 
a means of determining the 
depth of a sea, not effectual, C. 
Bonnycastle, xxxviii, 160. 
Eclipse, solar, Feb. 12, 1831, xxii, 
189, 
; ,in 1834, observation 
on, L. Brant, xxvii, 386. 
72 
’ , of May, 1836, obser- 
vations on, xl, 29. 
EDU 
Eclipse, solar, of Sept., 1838, ob- 
servations on, xxxvili, 158, 163, 
W725 174; xIkKiQ9; 
‘ , observations on, 
D, Olmsted, xxxv, 174. 
; , Ibid, micrometric mea- 
sures, LE, P. Mason, xxxv, 176. 
a , of July, 1842, xlii, 
175; xiii, 401; xliv, 211. 
_ 4 , observations sug- 
gested by, xlli, 395. 
Edinburgh, on the geology of Cal- 
ton Hill, near, J. W. Webster, 
i, 2380.f : 
, freshwater limestone of Bur- 
die House, S. Hibbert, xxviii, 365. 
Edmondson, T., modification of 
Ampere’s rotating galvanic ele- 
ment, xxvi, 370.f 
, rotating armatures, 
205f; xxxil, 399. 
Education in Africa, ii, 343. 
, In Egypt, xii, 389. 
in England, number of stu- 
dents at Cambridge and Oxford, 
XIX.) NOD: 
in Europe, by schools of mu- 
tual instruction, iv, 199. 
, in Austria, Vienna Po- 
lytechnic Institute, x, 379. 
, in Belgium, at Brussels, 
XXV1, 
vil, 382. 
xill, 173 ; 
x, 175. 
in Denmark, xii, 189; 
xvii, 394. 
, at Copenhagen, 
» 
~~ 
—— 
HOR. Xt 183. 
—_—__— 
9 P] 
, deaf and 
bequest 
Gump. cin don 
, in France, vii, 199; 
’ 
xil, 392. 
——— . ,in Paris, free 
commercial school, x, 171. 
——, ——, ——, M. Co- 
chin’s munificence, xvii, 394. 
—— » ——, at Caen, in pris- 
on, v, 382. 
—— ——, ——, at Lyons, xx,174., 
| 
—— ——, -——, at Marseilles, v, 
191. 
