940 



NEW YORK STATE MUSEUM 



Rectorite, 505*. 



Eefractoriness of clay, 511', 526^^, 563^; 

 of fire clays, 563^ 78P, 782^-83*; of 

 glass-pot clays, 786^; of stoneware 



clays, 792''. 

 Eefractoriness of shale, 841^. 

 Refractory clay products, 639^ 783*- 



84». 

 Remole, , on color of hard-burned 



clays, 517^ 

 Rensselaer, brick yard, 707*; clay de- 

 posits, 707*. 

 Rensselaer county, brick yards, 707*, 



708*, 709^ 

 Repressed power brick, illus. facing p. 



464. 

 Repressing bricks, 668*, 745*; illus. fac- 

 ing p. 668, 784. 

 Residual clays, 501^, 501'; occurrence, 



572^-73='; structure, 628'; analysis, 



860*-61». 

 Rhinebeck, stratification, 587*. 

 Rhizomorphs, 593". 

 Ries, Heinrieh, on terrace altitudes, 



590*. 

 Reisterer, Martin, brick yard, 722^. 

 Rigney, Mrs T., brick yard, 707*. 

 Riley & Clark, brick yards, 694«. 

 Riley & Rose, brick yard, 694*. 

 Ring pits, 659*-60'; illus. facing p. 



659. 

 Road materials, clay or shale used for, 



853==. 

 Roberts, J. B., brick yard, 707^ 

 Robitzels's Sons pottery works, 823*. 

 Rochester, brick yards, 720'-21'; clay 



deposits, 720^-21®; pottery works, 



824"; sewer pipe manufacture, 769"; 



shale, 828'; stratification, 720'. 

 Rochester brick and tile co., 720'-21»; 



illus. facing p. 652, 660, 669, 679, 



720, 773. 

 Rock face brick, 647'; illus. facing p. 



463. 

 Rockingham ware, 793', 814». 

 Rockland county, brick yards, 693*- 



95«; illus. facing p. 693. 

 Rockwell, G. A., use of Bischof's 



method, 558^ 

 Roman tile, 646*; illus. facing p. 463. 

 Rome, clay deposits, 576^ 714'-15'; 



brick yards, 714*-15*. 

 Rondout, clay deposits, 699'; terrace, 



579'. 

 Rondout creek delta, 577'. 

 Ronne, Denmark, kaolins, 498*. 

 Roofing tile, manufacture, 765'-66*, 



837^; illus. facing p. 765; properties, 



854»-55'; manufacturers, 913»-25*. 

 Roots, separation from clay, 634*. 

 Rose & Co., brick yard, 688', 698'; illus. 



facing p. 658, 698. 



Rose, A., & Co., brick yard, 701*. 



Rose, H. R., brick yard, 702'. 



Rosendale, stratification, 580'. 



Rosendale plains, stratification, 580*. 



Roseton, clay deposits, 58 1^ 698'; 

 delta deposits, 589^; brick yards, 

 688', 698'; illus. facing p. 658, 698. 



Roseville, terra cotta clays, 759°-60'. 



Rough hard bri<3ks, 67 8^ 



Russia, glass-pot clays, 787'. 



Rutile, 509*. 



Ryan, T., terra cotta clays, 759'-60'. 



Ryder, William, brick yard, 704". 



Sag Harbor, clay deposits, 603'. 



Saggers, 652', 811*-12^ 



St Johnsville, brick yard, 713'; clay 

 deposits, 713'; stratification, 713^ 



St Lawrence county, clay deposits, 

 575°; brick yards, 710', 711^ 711°- 

 12°. 



St Louis fire clays, per cent of quartz 

 in, 525*. 



Salina shale, 825^ 829^-30'; illus. fac- 

 ing p. 830. 



Salmon brick, 645', 677". 



Salt group, 829*-30'. 



Saltpeter, 680'. 



Salts, 512*; in brick clay, 639', 640«, 

 680=; determination of, 856'. 



Sammis, R., brick yard, 736'. 



Sand, 525=, 592'; used to prevent 

 shrinkage, 548', 548'-49'; in estuar- ' 

 ies, 592=; importance to clay in- 

 dustry, 629°; in brick clay, 637'. 



Sandford, C. L., brick yard, 736^ 



Sandrock, 582=, 584*. 



Sandstone, 582=, 584', 584', 587^ 596', 

 597=, 605'. 



Saratoga, brick yards, 709'; clay de- 

 posits, 709'. 



Saratoga county, brick yards, 708'. 



Sawdust, used to prevent shrinkage, 

 550'. 



Sawmill river, delta deposits, 588'. 



Schenectady, clay deposits, 576^; 

 terrace, 591'; depression of land, 

 591'. 



Schenectady county, shale, 826'. 



Schist, 583*, 584', 585=, 586*. 



Schmidt, G. W., brick yard, 723*. 



Sehodack terraces, 590'. 



Schrotterite, 505". 



Schultz, C. A., brick yard, 699', 700*. 



Sehusler & Co., brick yard, 723". 



Scorifiers, 613». 



Scotland, glass^pot clays, 787'. 



Scove'kiln, 674=, 674*-77', 689*; illus. 

 facing p. 674. 



Screens, 660^-61*, 801»-2*. 



