SUBJECT INDEX 



273 



salinity, effect upon Artemia, 259 



Sardinia, dwarf deer, 208 

 selection, and environment, 202 



— and growth-gradients, 88, 222, 223 

 sensitivity to hormones, and growth- 

 rate, 10 1, 184-6, 260 



sex-hormones, 177-9, 182, 188 

 shells, 145 seq. 



— bivalve, 162 



— conical, 155 



— foraminiferan, 163 



— logarithmic-spiral, 155 seq., 156 



— turbinate-spiral, 159 seq., 160 

 shoot, plants, 13, 14, 21 

 shoulder-girdle, grafted, 195 n. 

 size, adaptive increase of, 218-19 



— and differentiation, 39 n., 175, 179, 



181-2, 207, 2og, 212, 213, 222-4, 



258 



— limited by heterogony, 32 



— non-adaptive increase of, 220-1 



— range of in Lucanidae, 76 

 skeleton, fowl, 187 



— rat, 184-6 



skull, evolution of, in horse, 107, iog 



— form of, in man, 219-2J 

 soldiers, ants, 61 seq. 



— termites, 65 seq., 258 

 spiral, logarithmic, 151 seq. 



— turbinate, 159 seq. 

 starvation, 179, 180, 201, 202 

 sub-species, 205, 208, 2og-n 

 sulphur compounds, and growth, 169, 



170 

 sulphydryl, 169, iyo 

 systematics, 3, 204-14 



tail, man, 235 



— mice, 15, 17, 22, 200 



— salamander, 17 



' tail ', Papilio, 55, 57, 188 



taxonomy, 3, 204-14 



teeth, 150 



temperature, and relative growth, 200 



temperature-gradients, 172 



tendons, relative size of, 229 



teratology, 127 seq. 



testis, 177-8, 227, 257, 264 



thyroid, 181, 183-8, 257 



time of origin of organs, 140 seq., 

 201-2 



time-relations, growth and differen- 

 tiation, 133, 140 seq., 201-2, 232, 

 236-40 



tracheidai tract, relative size, 223-4 



trimodality, 73, 76 



undernutrition, 201, 202 



vestigial organs, 235, 236, 237 

 viscosity, and age, 7 

 von Baer's Law, 237 seq. 



water content, mealworm, 26, 29 



— — wax-moth, 29, 31 

 wing-rudiments, dragonflies, 17 

 wings, birds, 263 



— insect, 17, 113 

 workers, ants, 61 seq. 



— termites, 66 seq. 

 work-growth ratio, 186 



