INDEX 385 



Mayow, and chemical physiology, 126. 



Mechanical work, done by the animal, 67 ; not done by the plant, 71 



Mechanism, organic and inorganic, 78; i- ' / 



the thermodynamic, 66 ; radical, 215 ; in life, 121 

 Membranes, semi-permeable, 95. 

 Memor>', 39 ; 



a possible cerebral mechanism of, 158; mechanistic hypotheses 

 impossible, 157. 

 Mendelism, 196 : 



a logical hypothesis, 199 ; terminology is a symbolism, 198 ; analo-y of 

 unit characters with chemical radicles, 197 j transmission of characters 

 01, 230. 



Mesoderm, 177 ; 



origin of, 255. 

 Metabolism, ^7, 88, 209 ; 



analytic, 269; of animals, 65,675 constructive, 269; destructive, 269 ; 

 direction of, 69 ; m green plant, 70, 7S ; intra-cellular, 99; integration 

 of Its activities, in; role of oxygen in, 105; specialisation of durin<x 

 evolution, 305 ; synthetic, 269. 

 Metaphysics of science, 45. 

 Metazoan animals, 162. 

 Mitosis, 182. 

 Mobility, organic, 269 ; 



structural adaptations tending to, 275. 

 Modifications of structure 



adaptive and non-adaptive, 251. 

 Molecules, 353; 



size of, 116 ; in a gas, 115 ; aggregations of, 108. 

 Molluscs, morphology of, 249. 



Morgan, and physico-chemical mechanisms, 128, 143. 

 Morphogenesis, 257. 



Morphological evolution, tendencies of, 295. 

 Morphological structures 



degeneration of, 251 ; suppression of, 250 ; coalescence of, 250 • replace- 

 ment of, 250 ; specialisation of, 250 ; change of function of, 2;i 

 Morphology, 209 ; ' j • 



a basis of classification, 210; relates groups of organisms, 211 • dis- 

 tinctions of, not absolute, 285, 290; generalised, 250; suggests blood 

 relationships, 213; schemata of, 249, 291 ; cannot be considered apart 

 from physiology, 285. ^ 



Mosaic-theory of development, 131. 



Motion 



not an intellectual concept, 27 ; not considered in Euclidean or Cartesian 



geometry, 26: bodily motion is absolute, 24; outside ourselves is 



relative, 24. 

 Motor-habits, 38, 155. 

 Multicellular organisms, evolution of, 223. 



2b 



