188 



DEVELOPMENT OF THE FROG'S EGG 



Collecting tubes of pronephros, 156, 



157. 

 Communicating canal, 148. 

 Compression of egg, 95-105. 

 Concrescence, 64, 65, 80. 

 Correlation of parts, 124-126. 

 Cramer, account of cleavage, 49. 

 Cranial nerves, 164. 

 Cross-fertilization, 26-30. 

 Cross-line, 37, 39. 

 Ctenophor, half-development, 127. 



isolated blastomere, 129, 130, 132. 



half-larva, 130. 



fragment of egg, 131. 



imperfect embryo, 135. 

 Cutaneous nerves, 164. 

 Cuvierians veins, 153. 



Delamination, 41. 

 Development, direct, 128. 



indirect, 128. 

 Differentiation by protoplasm, 131. 

 Diverticula, from aorta, 155. 



from aortic bulb, 155. 

 Division (direct), of germ-cells, 11, 



12. 

 Dorsal aorta, origin of, 155. 

 Driesch, sea-urchin egg, 126, 127. 



action of nucleus on cell, 135. 



theory of embryo, 136. 

 Dumas, account of cleavage, 48. 



Ear, 162, 163. 



Echinodermata, isolation of blasto- 

 mere, 131. 

 Echinus, isolation of one-fourth and 



one-eighth blastomere, 133. 

 Ectoderm, 71, 72. 



ciliation of, 165. 



organs from, 159. 

 Efferent branchial vessels, 153-155. 

 Egg, separation from ovary, 15. 



orientation of, 81. 



rotation of, 83-85. 



rotation of contents, 91, 92. 



in centrifugal machine, 92-94. 



of Rana fusca, size of, 95. 



fragments of sea-urchin, 130, 131. 



ctenophor, fragments of, 131. 

 Egg-axis, 32. 



relation to cleavage-plane, 82, 85-87. 

 Egg-laying, Introduction. 

 Egg-membranes, 17, 19, 20. 



Egg-membranes, absorption of heat 



by, 20. 

 protection by, 19, 20. 

 Egg-nucleus, migration of, 13. 

 Elastic plates, 63, 64. 

 Embryo, on compressed egg, 98-101. 

 Embryonic ring, 64-66. 

 Embryos, double, 117-119. 

 Endoderm, 70, 73. 

 Endodermal cells of heart, 151. 

 Endothelium of heart, 151. 

 Endres and Walter, half -embryos, 115, 



116. 

 Epigenesis, 125, 126. 

 Evolution, 125, 126. 

 Eye, 60, 64, 161. 



Facial nerve, 164. 

 Fiedler, 126, 127. 

 Field, H. H., origin of pronephros, 155- 



158. 

 Fin, 62. 

 Flemming, spermatogenesis of Sala- 



mandra, 5, 6. 

 Fore-brain, 62, 100. 

 Fiirbringer, pronephros, 158. 



Ganglia, spinal, 62. 



Germinal localization, 125, 126. 



Germ-plasm, 124. 



Gill- arches, 62. 



Gill-plate, 58-60. 



Gill-slits, 62. 



formation of, 141, 144. 



relation of nerves to, 164. 

 Gills, ciliation of, 167. 

 Glomus, 156, 157. 

 Glosso-pharyngeal nerve, 164. 

 Goette, origin of pronephros, 158. 

 Gryllotalpa, 2. 



Half-blastula of Echinus, 127. 

 Half- embryos of Echinus, 133. 

 Half- larva, ctenophor, 130. 

 Head-kidneys, 156-158. 



veins from, 153. 

 Head-somites, 148. 

 Heart, 150-155. 



bending of tube, 151. 

 Hemiembryo, anterior, 109. 



lateralis, 107, 108. 



posterior, 109. 

 Hemiooholoplasten, 121. 



