INDEX TO CLAYS OF NEW YORK 



939 



Plasticity, of clays, 496', 504', 528», I 

 530^ 539^-44'', 637', 845'; of paving 

 brick, 744*; of glass-pot clays, 786'; 

 of stoneware clays, 79P-92^; of 

 shales, 825'. 



Platting, 674^ 



Plattsburg, clay deposits, 595', 709'- 

 10*; brick yards, 709'-10*; illus. fac- 

 ing p. 661, 674. , 



Plows, use of, 631'. 



Plunger machine, 663'; illus. facing 

 p. 664-65. 



Pocantico. river, delta deposits, 588'. 



Polishing and abrasive materials, 852'- 

 53^ 



Pompeian brick, 646*. 



Porcelain, 794^-98'; analysis, 794^,796^; 

 and white earthenware, comparative 

 composition, 796^; decoration, 814^- 

 17*; illus. facing p. 805, 808; glaz- 

 ing, 809^-11'; manufacture, 514"; il- 

 lus. facing p. 791-92, 794r-99, 802, 

 804; manufacturers, 823"; value of 

 output, 494"; vitrification, 796=. 



Porcelain clays, 568-; rational analy- 

 sis, 538'. 



Porosity, of clay, 522", 672°; of clay 

 wares, 854'-55'. 



Port Ewen, clay deposits, 577*, 579', 

 699^; terraces, 590'; brick yards, 

 699^ 



Port Kent, terraces, 594°. 



♦Port Washington, sands and gravels, 

 607'; illus. facing p. 596. 



Portage shale, 769', 826^; physical 

 tests, 83 P; distribution, 834"-36'; 

 analysis, 835'. 



Porter, I. R., brick yard, Athens, 704'. 



Porter, J., brick yard, Glasco, 701*. 



Portland cement, 845''-47''; clays and 

 shales used in manufacture of, 689', 

 847. 



Post, W. & J., brick yards, 733''-34=. 



Potash, 511^ 512*, 512^ 512», 513*, 515". 



Potsdam, brick yards, 711'; clay de- 

 posits, 7 IP. 



Potters' clay, in Kentucky, 618"; in 

 New Jersey, 623'; in South Dakota, 

 626*. 



Pottery, 791^-824'; decoration, 814''- 

 17*; different grades, 791'-98'; 

 glazes, 689^ 810--11'; manufacture, 

 620', 798"-814'; illus. facing p. 791- 

 808; manufacturers, 823^-24'; value 

 of output, 493», 494'. 



Pottery clays, 799^-806'; alkalis in, 

 515'; analysis, 878°-81'; lime in, 

 523''; magnesia in, 524'; silica in, 

 525'; tensile strength, 545'; 



in Colorado, 613°; Kentucky, 617*; 



Maryland, 619'; Mississippi, 620'; 

 North Carolina, 624'. 



Poutre, M., brick yard, 707'. 



Preparation of clay, 655^-60^; machines 

 used, 654^; pottery clays, 799% 799'- 

 803*. 



Prepleistocene clays, 606'. 



Pressed brick, 645^-46'; burning, 666*; 

 repressed, 668*; illus. facing p. 463- 

 64, 668; sorting, 679°; 



manufacture: clays used, 521', 639*; 

 use of shale, 827*; 



in Colorado, 613'; Indiana, 616'; 

 Louisiana, 619'; value of output in 

 New York, 493', 494'; New York 

 manufacturers, 650', 913'-25*. 



Preston brick co., 756*; illus. facing p. 

 756. 



Preston Bros., brick yard, 715% 



Printed ware, 815'-16^ 



Prospecting for clay, 629'-30% 



Puddle, 853'. • 



Pug mills, 660', 804=; illus. facing p. 

 660, 663, 761, 782. 



Purification of clay, 633'-35'. 



Putnam county, brick yards, 695'. 



Pyramids, see Seger cones. 



Pyrite, 508', 516', 604', 646', 680'; sep- 

 aration from clay, 634'. 



Pyrometer, 553', 560^-61'. 



Pyrophyllite, 505'. 



Pyroxene, source of alkaline com- 

 pounds, 514'. 



Quartz, 506-, 525% 526% 565% 578% 596% 

 652% 705% 793', 84P-44=; aid to fu- 

 sion, 563'; mineralogic characters, 

 841'-42'; preparation, 843'; illus. 

 facing p. 793; price, 843'-44'; prop- 

 erties, 534'; uses, 547% 548% 843% 

 See also Silica. 



Quartzite, 584'. 



Quassaic creek, delta deposits, 581% 

 588'. 



Quaternary clay deposits, 572% 573'. 



Queens county, brick yards, 733'-34'. 



Railroads, use of clay in construc- 

 tion, 853% 



Randolph, clay deposits, 576^; brick 

 yard, 725'; shale, 848*. 



Rathenow, analysis of clay from, 570*. 



Rational analysis, 533=-38"''. 



Rattlers, 746% 752°. 



Rattling tests on paving brick, 751". 



Ravena, quaternary plain, illus. facing 

 p. 591. 



Ravenswood, New York architectural 

 terra cotta co., 763% 764^ 



Raymondville, brick yard, 712*; clay 

 deposits, 712* 



