PES 
Perkins, J., mode of applying his 
method of generating steam to 
the boilers of ordinary steam en- 
gines, vii, 116, 332. 
, on steam engines, xill, 40. 
, on the cutting of steel by soft 
iron, vil, 3890. 
Perkins, T., salting of ship timber, 
iy, LT 
Perkins’s Algebra, noticed, xliil, 
380. 
Peron, on the temperature of the 
ocean, xvii, 295. 
Perrine, H., on the Agave and 
other plants used for cordage, 
xxv, 330. 
Perry, T. H., magnetic dip in dif- 
ferent regions, xlvil, 84. 
, method of adjusting the dip- 
ping needle, xxxvil, 277. 
——, onsome of the probable effects 
of a resisting medium, xxxviil,||/—— 
246. 
Persoon, obituary notice of, xxxil, 
215. 
Peru, Andes of, xviii, 182. 
, ——, highest elevations of, 
xviii, 184. 
‘ , highest habitations of 
men in, xvill, 183. 
: , trachytes of, xvill, 183. 
4 wttie mining regions of, 
XVIl, 43. 
, mines of, xvii, 43!; xxiv, 232. 
——, physical features, xvii, 47. 
, antiquities of, xvii, 116.¢ 
———, ancient and modern races of, 
S. G. Morton, xxxviii, 360", 365.‘ 
, ancient race of men in the 
Andes, xxix, 358. 
xii, 885, 
Blake, xxxix, 375; xliv, 1.f 
Peruvian bark, on, G. W. Carpen- 
ler, ix, 863; xvi, 28. 
, on a new variety of, G. 
W. Carpenter, xx, 52. 
, adulterations in, xix, 
81. 
198 
, Atacama, nitrate of soda of, 
» province of Tarapaca, J. H. 
Pestalozzi, H., death of, xiii, 183. 
PH I 
\Pestalozzian system, ix, 163; 
145. 
Pestum, stone of the temples at, 
Xxxvil, 366. 
Petalite in Canada, viii, 69. 
Petersburg, St., Russia, libraries of, 
Vt 
, Botanic Garden, xx, 175. 
Betrinieds see Fossil. 
Petrifying springs in New York, 
SKK V ed 
Petroleum in the salt Springs of the 
Ohio valley, xxiv, 63. 
in the valley of the little Ken- 
awha, xxix, 86. 
in the Kenawha valley, xxix, 
121. 
in the valley of the Sandy riv- 
er, Virginia, xxix, 129. 
or oil spring of Allegany Co., 
ING Wie P KRIS He 
, well of, near Burksyille, Ky., 
xxxix, 195. 
Pettengill, A., on floating islands, 
xii, 122. 
, Stellarota of, xvi, 363. 
Pettenkoffer, M., test for bile, xlix, 
206. 
‘Peucedanum ternatum, xxvili, 165. 
Pfaff, theory of voltaic electricity, 
xix, 178. 
Phacelia, species of, xlv, 171, 172. 
l/Phalzene) devastator, i, 154. 
Phalangium esculentum, iv, 60. 
Pharmaceutical preparations, 
373. 
Phascolatherium, xxxvil, 230. 
Phenacite, xxx, 177. 
, supposed locality at Goshen, 
Mass., C. U. Shepard, xxxiv, 329. 
, hot at Goshen, Mass., xliii, 
366. 
Phi Beta Kappa Society of New 
York, xxvii, 888. 
Philadelphia water works, vi, 379 ; 
vill, 198. 
, population of, xxi, 194. 
College of Pharmacy, Journal 
of, xxi, 1'78. 
Academy of Science, see 
Academy. 
Xy 
ii, 
