zo CONNECTICUT GEOL. AND NAT. HIST. SURVEY. 
Protameceba, 2, 12. 
Protospongia, 2, 38. 
Protoxide of iron, 4, 31, 32. 
Protozoa, classification of 2, 11. 
Protozoa of Connecticut, 2. 
Psathyrella, 3, 20, 52. 
Pseudochlamys, 2, 12. 
Pseudodifflugia, 2, 13. 
Psilocybe, 3, 19, 50. 
Psilotricha, 2, 57. 
Pug-mill, 4, 75, 76. 
Pyrite in clay, 4, 33, 34, 40. 
Pyrometers, 4, 49. 
Pyroxene, 4, 31. 
Pyxidicula, 2, 12, 
Pyxidium, 2, 63, 64. 
‘Quadrula, 2, 13, 15. 
Quartz, addition of, to china 
clays, 4, 51. 
behavior of, on heating, 4, 
30. 
composition of, 4, 40. 
effect of, on density of clay, 
4, 42. 
hardness of, 4, 42. 
in kaolin, 4, 29. : 
in kaolin of West Cornwall, 
4, 57. 
in rock residue, 4, 16. 
influence of, on shrinkage 
of clay, 4, 30. 
mining of, in- Connecticut, 
4, 71, 72. . 
specific gravity of, 4, 42. 
tendency to prevent warp- 
ing and cracking of clay, 
4, 30. 
Quartz flour, in Connecticut 
clays, 4, 60, 61. 
plasticity of, 4, 46. 
‘Quartz sand, in clay, 4, 39. 
‘Quartzite, glacial bowlders of, 
4; 23. ’ 
residuum of feldspathic, 4, 
57- 
‘Quartzose character of Connec- 
ticut clays, 4, 62. 
Quaternary age, 4, 18. 
‘Quicklime produced from clay 
_ , dogs, 4, 35. 
Quicksand in clay, 4, 13, 26, 62. 
Quinnipiac clay area, 4, 14, 62. 
Quinnipiac estuary, 4, 24. 
‘Quinnipiac valley, 4, 24.° 
Rain water, action of, on rocks, 
_ 4 I7. 
in cities, 4, 35. 
LJ . 
Raritan River, clays from, 4, 87. 
Rational analyses of Connecti~ 
cut clays, 4, 52, 60. 
Reactions in burning clay, 4, 49. 
Readvance of ice sheet, 4, 26. 
Red clays, for pressed brick, 4, 
55. : 
Refractoriness af clay, influence 
of density and fineness 
on, 4, 43. 
numerical value for, 4, 49. 
Refractory clays, effect of 
alkalies on, 4, 36. 
effect of iron on, 4, 33. 
effect of lime and magnesia 
on, 4, 35- 
grinding of, 4, 43. 
temperature withstood by, 
_. 4 31 
Residual clays, 4, 16, 17, 69. 
Residual kaolin of Connecticut, 
4 57. 
Retreat of ice-sheet, 4, 23, 24, 28. 
Rhabdomonas, 2, 25. 
Rhabdostyla, 2, 63, 64. 
Rhaphidiophrys, 2, 17, 18. 
Rhipidodendron, 2, 34. 
Rhizopoda, 2, IT. 
Rhyncheta, 2, 65. 
Rhynchomonas, 2, 21, 23. 
Rice, W. N., 3, 7, ro. 
Rich clay, influence of quartz 
on, 4, 30. 
Richness of clay, shrinkage de- 
pendent on, 4, 37. 
River floods, clays formed by, 
_. 4 70. 
Robinson, H. H., 1, 11, 4, 7. 
Rock flour, 4, 19, 60. 
Rocks, decomposition of, 4, 16. 
Rocky Hill, destruction of lake 
barrier at, 4, 28. 
gravel deposits at, 4, 23. 
ice halt at, 4, 24, 25, 26. 
Rosy-spored agarics, key to, 3, 
19. 
-Russula, 3, 18, 31. 
Rutile, composition of, 4, 40. 
Saccardo, P. A., 3, 6 
Sage, J. H., 1, 12. 
Sagging of bricks, 4, 32, 48 
Salpingceca, 2, 38. 
Salt glaze, 4, 89. 
Salts, soluble, detection of, 4, 
46. 
in Connecticut brick clays, 
4, 63, 64. 
