INDEX 



189 



Hertwig, 0., second maturation-divi- 

 sion, 8, 9. 



rotation of egg, 20. 



cross-fertilization of sea-urchin, 28. 



polyspermy, 30. 



origin of mesoderm, 70. 



formation of spina bifida, 77. 



effect of gravity, 90. 



compression of egg, 95, 99, 100. 



egg in tube, 101. 



lavr of cleavage, 102, 103. 



injury to blastomere, 112-115. 



methods of injury, 112. 



hemiembryo lateralis, 113. 



asymmetry of embryo, 113, 114. 



criticism of Roux, 114, 115. 



revivification of injured blastomere, 

 114, 115. 



criticism of, 121. 



quantitative division, 127. 



interaction of blastomeres, 134. 



effect of temperature, 168, 109. 

 [Heterotypic division, 5, 6. 

 Hind-brain, 160. 

 His, elastic plates, 63, 64. 



germinal localization, 125, 126. 

 Hoffmann, pronephros, 158. 

 'Homreotypic division, 6, 7. 

 Hydromedusae, isolation of blastomere, 



131. 

 Hyla, .spermatozoon of, 11. 

 Hyold arch, 145. 



vessel, 153. 

 Hyomandibular-cleft, 145. 



^- Idioplasm, 128. 



Infundibulmn, 160, 161. 



IiUeractiou of parts, 124, 125. 



Invagination of archenteron, 70. 

 ^ Isotropy, 87. 



Jordan, E. O., entrance of spermato- 



zoon, 35 



30. 



fertilization, 24. 



median plane of embryo, 42. 



overgrowth of blastopore, 68. 



Kolliker, account of cleavage, 49. 

 Kupffer, fertilization, 22. 



Lataste, cross-fertilization, 26. 

 Lateral line, 164. 

 Lens, 102. 



Liver, origin of, 141. 



relation of, to heart, 151. 

 Lungs, 145. 



Mandibular vessels, 153, 154. 

 Marshall, origin of gill-slits, 144, 145. 



account of lungs and thyroid body, 

 145. 



origin of optic nerve, 101. 



cranial nerves, 164. 

 Marshall and Bles, pronephros, 158. 

 Maturation-divisions, of Gryllotalpa, 

 2-4. 



of Salamandra, 7, 9. 



of frog, 10. 

 Maxillary process, inferior, 61. 



superior, 61. 

 Medulla oblongata, 160. 

 Medullai-y folds, inner, 57-59. 



outer, 57-59. 

 Medullary plate, 73, 158. 



formation of, 80. 



half, 108. 



length of, 80. 

 --Mesenchyme, 148, 149. 

 Mesoderm, 69, 71-74. 



early condition of, 146. 



extension of, ventrally. 146. 



around blastopore, 147. 



in region of pharynx, 147. 

 Mesodermic somites, 148. 

 IMethods of preservation, Appendix. 

 Meves, spermatogenesis of Salaman- 

 dra, 5, 9. 



direct division of germ-cells, 12. 

 Mid-brain, 160. 

 j\Iole-cricket, 2. 



Morgan, T. H., formation of spina 

 bifida, 77. 



injury to blastomere, 120, 121. 



isolation of blastomeres by, 133. 

 Morula, 107. 

 Mouth, 60, 61. 



Mliller, origin of pronephros, 158. 

 Muscle fibres, origin of, 149. 



Nasal pits, 62. 



Nephrostomes of pronephros, 156-158. 



Nerves, 163, 164. 



dorsal roots, 163. 



ventral roots, 163. 

 Nerve-tube, bending of, 160. 



closure of, 160. 



