330 



INDEX OF SUBJECTS 



larvae, 198, 199, 269 ; and rate of 

 development, 200, 204. 



Geryonia, 181. 



Gill slits, abnormal, 104. 



Girls, see Human being. 



Glands, growth of necks of, 5, 273 ; 

 branching of, 6 ; club-shaped, of 

 'Amphioxus, 6. 



Globules, of Wolff, 16. 



Glycerine, 132. 



Gonads, from coelomic epithelium, 6. 



Grafting of pieces of blastulae, 202. 



Gravity, influence on segmentation 

 of Frog's egg, 18, 78, 158; in- 

 fluence on development in general, 

 78 ; Pfliiget's views, 83 ; directive 

 influence of, experimentally elimi- 

 nated, 85 ; replaceable by a centri- 

 fugal force, 87 ; effect on Anfennu- 

 laria, 272, 273 ; on SerMaria, 272. 



Gray crescent of Frog's egg, 80 ; said 

 to be due to gravity, 87 ; caused by 

 spermatozoon, 247, 248. 



Gray degeneration, see Degeneration. 



Gray patch in inverted eggs, 85, 87. 



Green light, 94-96. 



Growth, a factor in development, 1, 

 279; conditions of, 1, 58, 59 ; local 

 inequalities of, 2, 3, 11 ; in length, 

 5 ; of spherical and plane surfaces. 

 6 ; defined, 58 ; without differen- 

 tiation, 104 ; dependent on ab- 

 sorption of water, 58, 59, 68, 115, 

 116. 146 ; and other substances, 58 ; 

 change of rate, 61-71 ; change of 

 variability during, 71-75 ; change 

 in correlations during, 75, 76 ; 

 rate of, defined, 60 ; variable, 74 ; 

 influenced by temperature, 101. 



Guinea-pig, chnnge of rate of growth, 

 post-natal, 61, 62, 65 ; pre-natal, 

 62; decline of variability in, 71. 



Gut, muscles of, 5 ; of Echinoderms, 

 3; imaginal, of Insecta, 5; of 

 Pluteus, in potassium, 137 ; with- 

 out sulphate, 143 ; without mag- 

 nesium, 147; without potassium, 

 146. 



Haemoglobin, not formed in absence 

 of oxygen, 110. 



Haemorrhage, due to cooling, 104. 



Hair, follicles, 7. 



Half-embryo, depends on position of 

 egg, 170, 171. 



Hand, rate of growth, 70 ; varia- 

 bility, 74. 



Harmony, causal, 284, 285, 292 ; of 

 composition, 285. 



Head, length, rate of growth, 70 ; 



variability, 74; correlations with 

 other parts, 75 ; breadth, rate of 

 growth, 70 ; variability, 74 ; corre- 

 lations with other parts, 75. 



Heart, the first organ to be formed, 

 accoi'ding to Aristotle, 13, 294 ; 

 -beat of Ohick at low temperatures, 

 104 ; halves of, remain apart, 104 ; 

 distended, 104 ; beat of Fundulus 

 in hypertonic solution, 117. 



Heat, 97 sqq., as affecting growth, 

 59 ; effect of, on Frogs' eggs and em- 

 bryos, 97-99; acclimatization to, 

 100 ; effect on Sphaerechinus ova, 

 105, 106, 187 ; on fertilization, 

 107, 108 ; stimuli, 272. 



Heliotropism, 272. 



Hemiblastula, 159 ; superior, 161. 



Hemicrania, 119. 



Hemi-embryo lateralis. 159, 171 ; 

 anterior, 161. 



Hemigastrula, 159. 



Hemikaryotic, 267. 



Hemimorula, 159. 



Hemitheria anteriora, 18. 



Hen's egg, axis vertical, 78 ; need for 

 being turned, 89 ; exposed to 

 shocks, 89 ; perpetually rotated, 

 90 ; exposed to sound-vibrations, 

 90 ; placed between poles of a mag- 

 net, 91 ; influence of light on, 93, 

 94 ; loss of weight of, 115 ; effect 

 of poisons on, 132. 



Heterocentron, 58. 



Heterodynamic centrosomes, 30. 



Heterogeneity of ovum, 2, 157 ; and 

 homogeneity, 298. 



Heterogeneous hybridization, 262. 



Hips, rate of growth, 70. 



Holoentoblastia, 139. 



Holothurians, segmentation of, 22. 



Homologies, sought for in descrip- 

 tive embryology, 12. 



Human being, decline of growth-rate 

 after birth, 63, 64, 65 ; before 

 birth (see Human embryo) ; rise of 

 growth-rate at puberty, 65 ; decline 

 of variability, 73 ; increase at pu- 

 berty, 73 ; decline of correlations, 

 75. 



Human embryo, percentage of water 

 in, 59, 60; decline of growth-rate, 

 in weight, 63 ; in stature, 68 ; of 

 organs, 70. 



Humid atmosphere, necessary for 

 Hen's egg, 115. 



Hybrid Pluteus from enucleate egg- 

 fragment, 253, 258-260; Plutei, 

 various, 262 ; heterogeneous. 262. 



Hydractinia, 47. 



