INDEX. 



697 



PAGE 



Organic matter in clay 74 



Oxygen ratio of clays 77- 96 



Paleolithic man — II 3 



Paleontology of Ohio — 



Chapter by R. P. Whitfield 407 



" C. L. Herrick 495 



" A. F. Foerste 516 



" " E. W. Claypole 602 



" E. O. Ulrich 627 



Paving block manufacture 129 



burning 175 



cost 205 



durability .... 204 



materials 129 



repressing ... 162 

 requirements 175 



size 202 



statistics 207 



tests 164-188- 



191 ,199, 240 

 vitrification .. 130 



Penfield brick machinery 143 



Pittsburg coal seam..... 282 



Plaster beds of Ohio 13 



Point Pleasant quarries 5 



Pomeroy coal 287 



Potters' clay ; 54 



Potters' machines 128 



Potters' Supply Co -. 127 



Pottery 89 



manufacture 101 



ornamental 128 



Putnam Hill limestone — clay of.. ..63- 64 

 Pyrometers-lunette pyrometrique... 85 



Quakertown coal 273 



Quartz in clay 76 



Raymond re-press 164 



Refractory clays 76 



Refractory materials 217 



River valley clays 137 



analysis 146 



Rockingham ware 66-118 



Rock-sait in Ohio 14 



Roofing-tile 239 



Rookwood pottery 128 



Salinagroup in Ohio 13 



Salt as a pottery glaze 108 



Salt-rock ...34-287 



Sand in clay 72 



Scale, geological, of Ohio 3 



Sciotoville fire-clay 58 



Seger's cones 86 



Sewer-pipeclays *. 137 



manufacture 209 



statistics 215 



PAGE 



Shale 51 



in brick making 132 



in Coal Measures 260 



Sharon coal 272 



Sharpsville sandstone 31 



Slate „.. 51 



Slipclays (10-103 



analysis 106 



Soil's of Ohio 39 



Steubenville coal 280 



Stone ware 91-103 



analysis of clays 94 



, clays used in... 92 



glazes 103 



statistics 111-117 



Structure, geological, of Ohio 39 



Sub-carboniferous formation in Ohio 34 



Sub-carboniferous limestone 35 



Sylvania sandstone 17 



Terra cotta 239 



Tile, encaustic 240 



roofing 2 .9 



Till 38 



Trenton limestone 4-5 



Tymochtee slate 16 



Ulrich, E. O., chapter by 627 



Union Furnace clav .- 62 



Upper Coal Measures 37 



Upper Freeport clay 67 



Upper Freeport coal 281 



Upper Helderberg limestone 18 



fossils of 419 

 Utica shale 6-7 



Valley clays 137-140 



Vitrified brick 58, 130, 175-209 



clays used lsl 



Waverly conglomerate 33—512 



fossils 512 



Waverly group 26 



divisions 26 



equivalents 



fossils 495 



Wellston coal 273 



Whitfield, Prof. R. P., chapter by 407 



White, Prof. I. C 31- 33 



Williams, Prof. H. S 505 



Winchell, Dr. A 21-496-497-498 



Wright, Prof. A. A., chapter by 620 



Yellow ware — clays used 11 8-1 1 9 



analyses 119 



statistics 123 



Zanesville clays 63- 95 



