POR 
Population of United States, rate of, 
increase since fireteencue’ XXXiil, 
BTheh, Pash 
of New York city, in 1826, 
x, 398. 
Populine, -xix, 380. 
Porcelain and porcelain clays, i, 
57. 
and earthenware, on the art, 
xxvi, 238f;—history of, 2335) 
Egyptian, 234; Tenaen. 234; 
Phenicia, 235; pincien mounds, 
237 ; Chine, 237; European, 
238; Wedgewood ware, 242; 
kinds of, 259; materials used 
for, 245 ; processes, 249; mode 
of glazing, 254. 
, mode of coloring, ili, 217; 
Xxvi, 256. 
, enamel for, v, 189. 
, manufactory at Philadelphia, 
xiv, 198; xvii, 384. 
, difference between the Eng- 
lish, and that of the continent, 
xxxill, 407. 
clay, from Granby, Ct., xviii, 
199. 
Delaware, xvili, 384. 
,in Maryland, 
XXVIl,} 
19. 
Porosity of glass and siliceous bod- 
ies, vil, 192. 
Porphyry of the Chinese frontier, 
XVII, 32. 
in Nova Scotia, xv, 208, 213. 
205 
, of Pennsylvania and 
POT 
Porter, J., notice of a rocking stone, 
ibe, PATI fs 
, on the American Antiquarian 
Society, xviil, 136. 
, on the garden of Fromont, 
xx, 83. 
Porter, J., Roxbury rocking stone, 
vii, 59. = 
Porter RNKE: 
Xxxvil, 347. 
Porter, T. D., contributions to the 
Geological Society, ii, 148. 
, geological notice of some 
parts of North and South Caroli- 
ha, iii, 227. 
, reply to T. Cooper on tests of 
arsenic, iv, 160. 
, mineral localities on the Con- 
necticut, ix, 177.f 
, Specimens of Zircon, iii, 229 ; 
Varies 
Porter, W. S., sketches eee 
ls Tilo 
Portugal, public eetneion in, Vil, 
198. 
Post office department, progress of 
the American, xv, 373. 
Post offices in France, income of, 
for 1824, x, 174. 
Postage of printed sheets in Eng- 
land, xlix, 228. 
Pot and pearl ashes, method of man- 
ufacturing, by G. d. Rogers, 
travels in Persia, 
of Peru, xvii, 57. 
Portable gas, xv, 189. 
lamp, il, 371. 
Porter, A. L., edition of Gray’s 
Operative Chemist, by, noticed, 
XIX, 362. 
Porter, J., floral calendar of Plain- 
field, Mass., 1818, i, 254. 
: ——, ibid, for 1819, 
ii, 2738. 
, on snow crystals, ii, 339. 
, minerals of Plainfield, v, 270. 
, catalogue of minerals, vi, 
246; vil, 58, 252; viii, 233; x, 
vill, 304. 
Potamogeton Claytoni, xlv, 38. 
pulcher, xlv, 38. 
Potassa in sea-water, 111, 371. 
——, caustic, of commerce, xxxv, 
299: 
, commercial, of New York, re- 
searches on, L.C. Beck, xxix, 260. 
‘ , adulteration: of, xxix, 
261. 
——, ——, manufacture of, xxix, 
261. 
18. 
26 
, mode of obtaining from feld- 
spar, Fuchs, xxi, 157. 
, detection of, by the oxide of 
nickel, xvi, 387. 
, mode of separating from soda, 
xxix, 273. 
