380 THE PHILOSOPHY OF BIOLOGY 



Darwin, and natural selection, 221 ; 



acquired characters are inherited, 220; hypothesis of pangenesis, 181. 

 Death, is catastrophic katabolism, 340. 

 Degradation of energy, 81. 

 Deliberation and consciousness, 281. 

 Demons, Maxwell's, 116. 

 Descartes and mechanism, 121 ; 



the rational soul, 123, 318 ; his physiology, 122 ; his spiritualism, 124 ; 



and animal automatism, 125. 

 Descent, collateral, 257. 

 Determinants in embryology, 132, 183 ; 



arrangement of, 184 ; latent in regenerative processes, 142. 

 Development, organisation in, 128 ; 



parthenogenetic, 176 ; reverses inorganic tendencies, 324 ; impossibility 



of chemical hypotheses, 141 ; is the assumption of a mosaic structure, 



301 ; blastula stage in, 129 ; gastrula stage in, 130; pluteus stage in, 



140 ; individual, 300. 

 Developmental systems 



prospective value of, 138 ; prospective potency of, 138. 

 Diatoms, 163 ; 



distribution of, 260. 

 Differential elements, 115. 

 Differentiation in development, 170. 

 Diffusion in the animal body, 95. 

 Digestion, 67 ; 



chemistry of, 72. 

 Dinosaurs, an unsuccessful line of evolution, 275. 

 Dissipation of energy, 114; 



in physical mechanisms, 59 ; by the organism, 68, 79. 

 Distribution of organisms, 262 ; 



limits to, 259 ; indicative of dominance, 258. 

 Diversity, physical, 54. 



effective and ineffective, 115. 

 Dominance 



in geological time, 258; implies long geological history, 261; 



Mendelian, 196. 

 Dominant organisms, 258, 259, 264. 

 Driesch 



natural selection, 229 ; analytical definition of the organism, 331 ; 



entelechy, 318 ; experimental embryology, 134 ; historical basis of re- 

 acting, 154; logical proof of vitalism, 136; proof of vitalism from 



behaviour, 153 ; theory of the absolute, 47. 

 Duration, 28 ; 



duration and time illustrated, 30 ; illustrated by immunity, 35 ; more 



than memory, 155 ; a factor in responding, 155. 



Ecdysis, 276. 



