. 
INDEX TO VOL. I. oO 
Nuclearia, 2, 17, 18, 
Nyctalis, 3, 18, 33. 
Ocliteapered agarics, key to, 
3, 18. 
Ochromonas, 2, 21, 33, 36. 
Odor of clay, 4, 41, 46, 63. 
Oikomonas, 2, 20, 22. 
Old Silex mine, 4, 72. 
Oligoclase, composition of, 4, 
40. 
Omphalia, 3, 18, 36. 
Onychodromus, 2, 57, 59. 
Opercularia, 2, 63, 65. 
Ophrydium, 2, 63. 
Ophryoglena, 2, 41, 47. 
Opisthodon, 2, 42. 
Organic matter, effect of, in 
_ , clay, 4, 32, 34, 38, 40, 47. 
Origin of clays, 4, 16, 22. 
Outlets of temporary lakes, 4, 
25. 
Oxidation of pyrite, 4, 34. 
Oxide of titanium in clay, 4, 37. 
Oxides of iron in Connecticut 
clays, 4, 61. 
Oxygen in formation of sul- 
phuric acid, 4, 33, 38. - 
Oxytricha, 2, 57, 59. 
Paleozoic eon, condition of 
Connecticut at close of, 
4, 22. 
Pallet, 4, 81, 82, 83. 
Pamphagus, 2, 13, 16. 
Panzolus, 3, 20, 52. 
Pandorina, 2, 34, 37. 
Panus, 3, 18, 38. 
Paper clays, 4, 52. 
Paramecium, 2, 41, 48. 
Parkville, 4, 12, 75. 
Paving brick, 4, 36, 51, 54, 65. 
Paxillus, 3, 18, 39. 
Peat overlying Quinnipiac clay, 
4, 14. 
Pebbles in clay, 4, 27, 63, 75. 
Peck, C. H., 3, 6. 
Pegmatite, 4, 17, 18, 69. 
Pelomyxa, 2, 12, 14. 
Peranema, 2, 25, 28. 
Percival, J. G., 1, 9. 
Peridinium, 2, 39. 
Peritricha, 2, 39, 62. 
Petalomonas, 2, 25. 
Phacotus, 2, 33. 
Phacus, 2, 25, 27. 
Phalansterium, 2, 38. 
Phascolodon, 2, 42. 
Pholerite, 4, 29. 
Pholiota, 3, 18, 41. 
Phyllomitus, 2, 29, 31. 
Physical methods for determin- 
ing fusibility of clay, 4,. 
49. 
Physical properties of clay, 4, 
41, 62. 
Pinaciophora, 2, 17. 
Pipe clay, 4, 51. 
Plagioclase, lime in, 4, 34. 
Plakopus, 2, 12. 
Plantsville, 4, 23, 24. 
Plastic Pi shrinkage in, 4, 
46. 
Plasticity, as property of clay, 
4, 44. 
cause of, 4, 37, 44. 
determined by feel, 4, 42. 
importance of, 4, 46. 
loss of, 4, 38. 
of Connecticut brick clays, 
4, 63. 
of earthenware clays, 4, 55. 
of kaolin, 4, 51, 58. 
of minerals in clay, 4, 39. 
of pressed-brick clays, 4, 
55: 
regulated by sand or grog, 
4, 30, 45, 46. 
Platoum, 2, 14. 
Platy structure of clay, 4, 38, 
44, 45. 
Platytrichotus, 2, 57, 59. 
Pleuromonas, 2, 30. 
Pleuronema, 2, 42, 50. 
Pleurotricha, 2, 57, 59. 
Pleurotus, 3, 18, 32. 
Plowing, mining by, 4, 62, 73. 
Podophrya, 2, 65, 66. 
Polygonal blocks 
clay, 4, 41. 
Polyporacez 3, 12, 53. 
key to the genera of, 3, 54. 
Polyporus, 3, 55, 65. 
Polystictus, 3, 55, 64. 
Polytoma, 2, 32, 35. 
Pompholyxophrys, 2, 17. 
Porcelain clay, 4, 15, 51. 
Potash, 4, 17, 30, 33, 36, 37. 
Potassium sulphate, 4, 40. 
Poteriodendron, 2, 20. 
Prantl, K., 3, 12. 
Pressed brick, 4, 55, 80. 
Pressure, effect of, on included 
water in clay, 4, 43. 
Prorodon, 2, 40, 45. 
Prospecting, 4, 69, 70. 
in jointed’ 
