188 



DEVELOPMENT OF THE FROG'S EGG 



Collecting tubes of pronephros, 156, 



157. 

 Communicating canal, 148. 

 Compression of egg, 95-105. 

 d Concrescence, 64, 65, 80. 

 Con-elation 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. 

 Cuvierian^ 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. 

 'iGerm-iDlasm, 124. 

 Gill-arches, 62. 

 Gill-plate, 68-60. 

 Gill-slits, 02. 



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. 

 Ilalf-embryos of Echinus, 133. 

 Half-larva, ctenojjhor, 130. 

 Head-kidneys, 156-158. 



veins from, 153. 

 Head-somites, 148. 

 Heart, 150-155. 



bending of tube, 151. 

 ifHemiembryo, anterior, 109. 



lateralis, 107, 108. 



posterior, 109. 

 "/•^Hemiooholoplasten, 121. 



