SUBJECT INDEX 



{Figures in italics refer to pages with illustrations of the subject cited.) 



abdomen, crustacean, 14, 75, 16, 17, 

 20, 34, 35, 68, 69, 86m., g3, 94, 



95. 239 

 achondroplasia, 131 

 adaptation, 214, 219 

 adrenal, 257-8 

 adult phase, 39 



age, physiological, 175 



anencephaly, man, 127, 130 



angle, constant, of logarithmic spiral, 



157 

 antennae, 55, in, 112, 113, 114, 115, 



175 



— copepods, 85, 86 

 antero-posterior differentiation , 



ii8m., 132 seq., 139 

 antlers, deer, 17, 42 seq., 43, 44, 46, 



4J, 48, 205, 206, 207, 210, 216, 



218-19, 227 

 ash content, mealworm, 29 

 asymmetry, fiddler-crabs, 121, 166, 



189 



— hermit-crabs, 112, 190 



— in heterochely, 96 seq., 189-91 

 auxano-differentiation, 120, 148, 232 

 axial gradients, 139, 171-6, 242 



beak, Hornbills, 15, 23 

 beard, man, 102 

 bimodality, yi, 72 n., 73 

 bio-electric potential, 174, 260 

 body-build, man, 232, 233 

 brain, chick, 145, 146 



— mammals, 17, 215-16, 225 



— rat, 164, 185 

 breadth-growth, and depth-growth, 



96, gy, 100, 200 



— and length-growth, 95, 96, 97, 96', 



100, 114, 115, 173, 200, 203, 234 



carapace, crustacean, 23, 24, 25, 27, 



106, loy, 203, 258, 261 

 Cartesian co-ordinates, 104, 105, 106, 



J07, 108, iog 

 castration, 177-8, 183 

 chelae, 8 seq., 14, ly, 31, 33, 34, 38, 53, 



55. 69, 70, 80, 82, 83, 84, 85, 90, 



gi, g2, 96, gy, g8, 99, 119, 121, 

 166, 167-9, 216, 22y, 238, 262-3 



chelicerae, spiders, 261 



chemo-differentiation, 119, 150, 168, 

 169 



comb, fowls, 177-8 



combustion, heat of, 28, 29, 30 



correlation, vii, 221 



— of growth-effects, 120 seq. 

 cranium, mammals, 14, 18, ig 

 crest, newts, 179, 180 

 crusher claw, 96, gy, 189-9J 

 cyclopia, 172 



Developmental Direction, law of, 132 



seq. 

 differentiation, direction of, 168 n. 



— law of antero-posterior, 118 n., 



132 seq., 139 

 digits, proportions of, 130, 188, 235, 



262 

 dimorphism, 68 seq. 



— developmental, 70 



— environmental, 71 



— genetic, 70 

 diphasic species, 70 

 dominant region, 172, 173, 175 

 dwarfs, ateliotic, 131 



— mongoloid, 131 



eczema, 259 



eggs, relative size in birds, 225-26 

 elytron, beetles, 25, 114 

 environment, influence upon relative 



growth, 197 seq. 

 equilibrium-position, 36, 232 

 evolution, 3, 106 seq., 216 seq. 

 eye, Drosophila, 14, 21, 22 



— stick-insect, 27 

 eye-colour, Drosophila, 231-2 



— Gammarus, 228, 229, 230-2, 237- 



38 



— man, 232 



eyes, grafted, 51, ig2, ig3, ig4, [95, 

 196, 197 



— rat, 184, 185 



270 



