198 



Crystalloids, 101 

 Crystals, basic, 37 

 Culture, centers of, 188, 189 

 Cyanogen, 99 

 Cycads, 65, 73 

 Cyclostomes, 120 

 Cynodonts, 128 

 Cysts, 96, 97 



Daly, R. A., 32 



Dana, J. D., 50, 69 



Darwin, C. R., 108, 155 



Death-rate, cause of differences in, 163 



effect of storms on, 166 



effect of temperature on, 164 

 Deaths, statistics of, 158, 159, 160, 161 

 Deer, 136, 137 

 Denudation, 58 



rates of, 59 

 Deposition, rate of, 68 

 Deposits, cycles of, 58 



glacial, 54, 56 



organic, 58 



salt, 32 

 Derham, W., 91 

 Deserts, 73, 185 



effect of, on man, 150 

 Devonian, Lower, 123, 144 



period, 46, 76, 79, 111, 122 



period, aridity in, 143 



period, diastrophism in, 122 



Upper, 145 

 Diastrophism, 50, 110, 118, 133 



Devonian, 122 



Miocene, 146 



Mississippian, 125 



Pennsylvanian, 127, 145 



Silurian, 122, 144 

 Diaz, 182 

 Dinocerata, 136 

 Dinosaurs, 73 



ankylosaurs, 132 



armored, 130, 132 



associated with peneplanation, 133 



INDEX 



Dinosaurs, bipedal, 129 



carnivorous, 130, 132 



Ceratopsia, 132 



duck-billed, 132 



effect of, on mammals, 133 



evolution of, 145 



expansion of, 145 



extinction of, 131, 132, 134 



nodosaurs, 132 



origin of, 111, 129 



Sauropoda, 111, 130, 132, 145 



Stegosauria, 130 



Theropoda, 130 



trachodons, 132 



unarmored, 132 

 Diplocynodon, 133 

 Diplodocus, 130 

 Dipnoans, 121, 122 

 Disruption hypothesis, of Chamberlin 



and Moulton, 46 

 Disturbances, 70 

 Dog, 177 



Double-breathing, 120 

 Dromocyon, 135 



Earth, 105 



age of, 57 



as a planet, 5 



atmospheric blanket of, 54 



crustal readjustments in, 78 



diameter of, 48 



effect of moon on, 28 



effect of, on moon, 30 



evolution of, 45, 94 



granitic crust of, 34 



growing, atmosphere of, 51 



-growth, by rapid infall of plan- 

 etoids, 25 



-growth, by slow accretion of plan- 

 etesimals, 24 



-growth, in Formative era, 47 



internal heat of, 48, 49 



-moon knot, 19 



negative areas in surface of, 50 



