INDEX. 



545 



Page 



Palmyra, clay near, 339, 391 



Paper clay, 216 



Parker, J. A., clay of, 479 



•Parmelee, C. W., article by, 293, 294 



Parsippany, clay at, 480 



Passaic basin, clay in upper 128 



Passaic county, clay deposits of, .... 493 



Passaic valley, clay in, 128 



Paxson Co., J. W., clay pits of, 376 



Pedrick, G. C, clay of, 121, 425 



Pensauken clays, 133 



fossils in 134 



Pensauken creek, clays near, . .201, 388, 399 



Pensauken formation, I 33 -I 35 



Pensauken gravels, quartz nodules in, 43 



Pentonville, clay at, 494 



Perrine & Son, H. C, clay banks 



of, 454. 459 



Perth Amboy, clay at, 464 



Physical properties of clay, 81-115 



Physical tests of clays, tables of, . . 



346-364,525 



"Pine Brook, clay near, 477 



Pipe clay, 190, 215, 338 



definition of, 214 



Middlesex county, 459 



Plasticity, 81-83 



Pleistocene clays, . . . 123-135, 289, 403—405 

 economic description of, .. .343-348 

 soluble salts in, quantity, .... 78 



specific gravity of, 114 



Pleistocene formations, subdivisions 



of, 123 



Pleasant Mills, clay at, 371 



Ponds, 26 



Porcelain, burning of, 105, 301 



clays for, 296 



decoration of, 303 



electrical, 303 



glazing, 302 



value in 1902, 309 



Port Murray, clay shale at, 507 



mining of, 36 



Post-Pleistocene clays, The, character 



and location, 1 19-122 



economic description of, .. .343-348 



specific gravity of, 114 



Post- Pleistocene clay loams, 121 



Pot clay, 216 



Potash feldspar, source of alkalies,... 68 



Potash in clay, effect of, 67 



Pottery, clays for, 294 



alkalies in, 67 



lime in, 64 



magnesia in 67 



silica in, 55 



methods of manufacture, . ..297—303 

 New Jersey industry, ..304-309,510 



early history, 304 



list of manufacturers,. .. .305, 309 



Pottery, N. J. industry — Continued. Page 



value in 1902, 309, 510 



Trenton, 305, 511 



Prall, J. P., 422 



Pre-Cambrian formation, clays in, ... . 208 



Preface, xxiii 



Preparation of clay for market, 36 



Pressed brick, 218 



clays used for, 221 



temperature in burning, 248 



Properties of clay, chemical, 39-80 



physical, 81-1 15 



Prospecting for clays, 25 



Pug mills, brick manufacture, 225 



pottery manufacture, 298 



Pyrite, alteration to magnesium sul- 

 phate, 64 



in clays, 46, 322 



Pyroxene, source of magnesia, 64 



Q. 



Quartz in clay, 42 



R. 



Rancocas, clay near 385, 387, 390 



Rajotte's clay pits, 120, 503 



Rapp, A. C, clay of, 426 



Raritan clays 161-203 



character of 161-163 



economic description of, .. .363-365 



fire clay, 192-196 



formation of, 164 



location of, 165 



potter's clay, 192-196 



soluble salts in, 77 



specific gravity of, 114 



subdivisions in, 166 



stratigraphic relations, 163 



thickness of, 163 



Raritan river, clay north side of,.... 464 



Rational analysis of clay 52 



Raymond pulverizer, 38 



Red sand, 151 



Red shales, 24 



Reed, B. H., & Brother, clay of, 430 



Reeve, A., clay of, 383 



Refractoriness of fire brick, 326, 333 



fire clays, tables of, ..315, 319, 



320, 441, 445, 450, Appendix D 



Refractory clays, defined, 100 



Middlesex county, 444-455 



Reports of the Survey, xxiii 



Re-pressing 232, 260 



Residual clay, 6, 82 



Retort clay 10, 215, 337 



Richmanville, clay at, 498 



Ricketts, J. B., clay of, 480 



Riddletown, clay near, 499 



