M A G 
Magnetism, connexion of, with heat 
and electricity, J. F. Dana, vi, 
163. 
— 
vy] 
i, 89. 
: , with geology, J. Locke, 
xlvil, 101. 
, conversion of, into electricity, 
xxii, 386. 
, currents and sparks of elec- 
tricity from, J. Henry, xxii, 403. 
, destroyed by lightning, xii, 
382. 
, Gauss’s theory of, tested by 
observations, EH. Loomis, xlvii, 
278. 
——., Hansteen’s discovery in, y,| 
190. 
, influence of heat on, xxii, 
361. 
of soft iron, acquired by in- 
duction, retained for some time if; 
the armature is not removed, 
Xxvill, 63. 
, molecular forces, on the dis- 
turbance of, by, C.G. Page, xxxiil, 
118. 
produced by friction, xix, 394. 
by astroke of lightning, 
, with light, G. Gibbs, 
vi, 394. 
—— by voltaic electricity, 
lil, 383. 
—— —— by the solar rays, Xxiil, 
171. 
, double helix for inducing, C. 
G. Page, xxxv, 261. 
Magnetization, some phenomena of, 
De Nairac, xxvii, 401.f 
Magneto-electric apparatus, and ex- 
periments, J. P. Emmet, xxiv, 
78f; xxvi, 8113 xxviil, 331. 
WO RenLennys 
XXviil, ddl. 
——, E. -M. 
Clarke, xxxiii, 213.f | 
Sie sors 
Page, xxxiv, 163', 364f; xxxv, 
112f, 2526; xxxvii, 275f; xlviii, 
eo 2: 
—, 0. W. Gibbs, 
Xxxix, 132. 
152 
M ATI 
Magneto-electric apparatus and ex- 
periments, J. H. Abbot, xl, 104.f 
electrepeter, EH. M. 
Clarke, xxxiii, 224.f 
> C.1G.. age, 
xxxy, 112.f 
electrotome, 
Page, xxxv, 112!, 253.f 
formula, xxxv, 356.f 
multiplier, C. G. Page, 
XXxvil, 275.f 
-——- shock increased by a 
long coil, J. Henry, xxviii, 331. 
increased by pass- 
ing it through a portion of the 
generating magnet, J. P. Emmet, 
Xxvili, 381. 
Magneto-electricity, J. Locke, xxxiv, 
125.f 
Magnetometer, new, A. D. Bache, 
xl, 380. 
Magnolia grandiflora, xxvi, 314. 
Mahogany, artificial, ix, 206. 
Mahomet Ali, notice of, xxviil, 
30. 
Maine, geological reports of C. T. 
Jackson on, noticed, xxxii, 193 ; 
xxxv, 387; xxxvi, 148; xxxvil, 
376. 
, miscellaneous remarks on the 
geology of, C. T. Jackson, xxxiv, 
69 ;—actual bituminization of 
peat, xxxiv, 73. 
, anthracite coal formation of, 
C. T. Jackson, xxxvi, 149. 
, dikes of trap, and metamor- 
phic limestone, C. T. Jackson, 
xxxvl, 145, 147. 
iron ore veins, C. T. Jackson, 
xxxvi, 147, 150. 
, changes of level in, C. T. 
Jackson, xxxvi, 154. 
, fossiliferous rocks near Moose 
river, Xxxvil, 378. 
Maine, list of some plants in, J. W. 
Bailey, xxxii, 22. 
, minerals of Freyburg and 
Paris, xviii, 291. 
Mairan, on the Aurora Borealis, al- 
lusion to, xxix, 388; xxxil, 177; 
xxxiv, 288, 289. 
CoamnG. 
