PEN 
Pennsylvania, Lehigh coal, analysis 
of, xl, 373. 
, Lehigh river, 
J. Pierce, xii, 59. 
» Mauch Chunk and vicinity, 
xii, 56, 60. 
—,, B. Silliman, xix, 
7;—canal, 7, 8; scenery, 8; rail- 
road, 9,165; cost of main railway, 
11; mines, &c., 115; public house, 
16. 
, mineral resources 
Pierce, xii, 54. 
, Monongahela valley, rocks 
and coal, xxix, 58, 60!, 63.f 
, Port Pitt remains, W. B. 
Weed, xxi, 197. 
——, Pittsburgh coal strata, xxix, 
68.f 
F , amount of coal con- 
character of, 
J. 
of, 
OT. 
Pr R 
Pennsylvania, Westmoreland Co., 
footprints in, A. 7. King, xlvili, 
217,343! ; xlix, 216.0 
, Wyoming region and coal 
Biel) iv, lf; vii, 260. 
—— ——, J. Pierce, 
v) 
xii, 66. 
: —— ——, B. Silli- 
man, xviii, 809! ;—disputed title, 
315; scenery and surface, 316; 
people, forts, battle ground, 
317. 
Pentremites, see Zoonoay, Radi- 
ala. 
Pepper, analysis of, iv, 890. 
Pepys, W. H., electro-magnetic ap- 
paratus, vil, 195. 
Perca nobilis, dissection of the eye 
of, xxvii, 216.4 
Perehloric rather) xlil, 63. 
sumed at, xxix, 79. 
, manufactures of, xxix, 
’ 
79% 
, Potsville or Mount Carbon, 
J. Pierce, xii, 63, 65. 
, , descent from, to Phil- 
adelphia, xii, 64. 
» ——, Carbondale, xviii, 3138, 
319, 324. 
, salt wells of Conemaugh and 
Kiskiminitas, xxix, 72, 74. 
; —-—, coal con- 
sumed in the manufacture, xxix, 
vik 
: springs of Conemaugh 
and Kiskiminitas, and manufac- 
ture, xii, 70. 
—— —— near Pittshurgh, 
nil; 72. 
> —— ——in Mercer Co., 
xii, 72. 
, scenery from Tarrisburg, 
westward, W. B. Weed, xxi, 197. 
, schuylkill, passage of, and of, 
canal, through the Blue Ridge, J. 
Pierce, xii, 64; navigation of, 
65 
, soil of the counties near Ohio, 
xil, 73. 
, trap dikes in, H. D. Rogers, 
ieee solution of a 
Percival, J. G., minerals of Berlin, 
v, 42,f 
——, analysis of Ad. Brongniart 
on fossil vegetation, vil, 178. 
‘+, on the geology and mineral- 
ogy of Sicily, vill, 201. 
—-, on the zoological characters 
of formations, vill, 213. 
——-, curious effact of solar light, 
xii, 169, 180. 
, Report on the 
Connecticut, notice 
187. 
, crescent form of dikes first 
observed by, xlvi, 205, 
Geology of 
of,  xliv, 
Percussion powder, xvili, 156. 
Perdicaris, G. A., on the revival 
of letters in Greece, xxxvi, 
192. 
Perkins, G. R., interesting proper- 
ties of numbers, xl, 112. 
functional equa- 
tion, xlil, 69. 
,bew method of computing 
interest, xlvil, 51. 
Perkins, H. C., notices of fossil 
bones from Oregon, xlii, 186.f 
Perkins, J., compressibility of wa- 
ter, ili, 847.6 
, engraving on steel, ili, 353. 
xli, 173. 
5 
2 
, new steam engine, vii, 111.f 
