EPI 8 
Enfield’s Natural Philosophy, re- 
view of, ili, 125. 
England, population of, xxiv, 211. 
Aingelmann, G., Braun’s mono- 
graphy of N. American Equiseta, 
with additions, xlvi, 81. 
, Braun’s Chare of N. Ameri-|| —— 
ea, xlvi, 92. 
, catalogue ef a collection of 
plants in Illinois and Missouri, 
xlvi, 94. 
, monograph of the N. Ameri- 
can Cuscutinee, xliii, 333/; xlv, 
73. 
394. 
Engine, explosive, of S. Morey, 
account of, xi, 104. 
, steam, see Steam engine. 
Engolish lexicography, contributions 
to, J. W.*Gibbs, xxxili, 3243 xli,! 
28, 32; xlv, 96. 
Engraving, a mode of enlarging, il, 
342, 
, a mode of biting-in, on steel, 
xl OL. 
, in taille douce, iv, 192. 
on steel, Perkins’s invention, 
ili, 853. 
Epicycloid, on the, E. F. Johnson,| 
xxi, 280.f 
Epidemics, in Paris, during past 
years, xxv, 197. 
Epidote of Franconia, N. H., ac- 
count of, C. U. Shepard, xviii, 
129.f 
, crystals from Haddam, Ct., 
xlvi, 380.f 
62. 
, in N. Carolina, v, 262. 
, In Connecticut, 1, 354; 
Tey 240 vin 22easivill, 208 5) Xi, 
1705 xviii, 361. 
—, , in Delaware, xiv, 11. 
——, ——, Massachusetts, 1,114; 
ill, 864; vi, 2235 vil, 253 ; ail 
235i, 4a 
» New Hampshire, ii, 
vi, 2453 vili, 2855 xviii, 
241; 
129. 
,a mode of cupellation, xlii,! 
, localities of, in Canada, viii,| 
1 
ERE 
Epidote, localities of, in New Jer- 
sey, V, 249. 
; , 1n New York, il, 241; 
iv, 47; vii, 58; ix, 41. 
; , in Pennsylvania, viil, 
238; xiv, 6. 
—, , in Rhode Island, iv, 
285; x, 10. 
,in Vermont, vil, 58; 
9 
Xvil, 354. 
Epistilbite and Heulandite, identity 
of, xiii, 185. 
Equations, differential of the second 
order, integration of, T. Strong, 
xlii, 273. 
of the fourth degree, on the 
resolution of, xvill, 276. 
of the third and fourth degree, 
method of resolving, A. C. Twin- 
ing, 1x, 86. 
Equilibrium between living and 
dead forces, condition of, R. H. 
Fauntleroy, x\vii, 241.f 
Equinoxes, precession of, vii, 3235 ; 
vili, 182, 139.f 
Equiseta, N. American, A. Braun’s 
monograph, with additions by G. 
Engelmann, x\vi, 81. 
Equisetum arvense, xlvi, 83. 
—— boreale, xlvi, 90. 
eburneum, xlvi, 84. 
giganteum, xlvi, 91. 
|—— hyemale, xlvi, 89. 
—— levigatum, xlvi, 87. 
—— limosum, xlvi, 86. 
palustre, xlvi, 85. 
pratense, xlvi, 85. 
robustum, xlvi, 88. 
scirpoides, xlvi, 91. 
sylvaticum, xlvi, 84. 
variegatum, xlvi, 90. 
Equivalents, chemical, Wollaston’s 
scale of, xvi, 371. 
——, ——, improved, E. 
C. "Beck and J. Henry, xiv, 202. 
= circular scale of, J. 
nen xvill, 196. 
Eremite, a new mineral, C. U. Shep- 
ard, xxxii, 841.f 
, crystallographic examination 
of, J. D. Dana, xxxiii, ‘70. 
