INDEX 



191 



Roux (continued). 



median plane of embryo, 42. 



experiments with oil-drops, 43-47. 



spina bifida, 75. 



centrifugal machine, 92-94. 



egg in tube, 100, 101. 



methods, 106, 107. 



injury to blastomere, 106-111. 



cleavage-plane and embryo-axis, 

 108. 



mosaic theory, 109, 123, 126. 



whole embryos, 121. 



subsidiary hypothesis, 127-129. 



anachronism in cleavage, 129. 



part of egg removed, 130. 



qualitative division of nucleus, 



134. 

 Rusconi, cross-fertilization, 24. 



account of cleavage, 48. 



Sachs, law of cleavage, 102. 

 Salamandra, isolation of blastomere, 



131. 



Salt-solution, effect of, 77. 

 Schleiden, 49. 



Schnetzler, effect of light, 169. 

 Schultze, M. , segmentation, 39. 



account of cleavage, 49. 

 Schultze, O., formation of egg, 12. 



rotation of egg, 20. 



polar bodies, 21. 



origin of mesoderm, 71. 



experiments of, 116-118. 



effect of temperature, 169. 

 Schwann, 49. 

 Sea-urchin, cross-fertilization, 30. 



isolation of blastomeres, 126. 



half development, 127. 



fragments of egg, 130, 131. 

 Segmentation, variations of, 41. 

 Segmentation-cavity, 40, 41, 67, 71. 

 Self-differentiation, 123, 124, 126. 

 Seniiblastula verticalis, 107, 108. 

 Semigastrula verticalis, 107, 108. 

 Semimorula verticalis, 107, 108. 

 Sense-plate, 57-60. 

 Sex-cells, development of, 1. 

 Sinus venosus, 151. 

 Size of egg, 95. 

 Somatic layer, of mesoderm, 147. 



of heart, 151. 

 Somites, mesodermic, 148. 



of head, 148. 



Spallanzani, egg-laying, 17. 



account of cleavage, 47. 

 Spermatid, 1. 

 Spermatocyte, 1. 

 Spermatogenesis, 1, 10. 



salamander 4, 5. 



Spermatogenesis and oogenesis, com- 

 parison of, 13, 14. 

 Spermatogonia, 1. 

 Spermatozoon, of frog, 4, 5, 11. 



inheritance through, 134. 

 Spina bifida, 75-80. 

 Splanchnic layer of mesoderm, 147. 



of heart, 151. 



Star-fish, cross-fertilization, 30. 

 Stomoda3um, 60, 159. 

 Strasburger, action of nucleus on cell, 



135. 



Suckers, 60, 62, 166. 

 Swammerdaui, passage of egg from 

 ovary to oviduct, 17. 



account of cleavage, 47. 

 Sylvian aqueduct, 100. 



Tail, 62. 



Teleostei, isolation of blastomere, 131. 



Temperature, effect of, 167-170. 



Tetrad, 3, 4, 8. 



Thyroid body, 145. 



Toad, European, spermatozoon of, 



11. 



Totipotence, 132, 133. 

 Trigeininal nerve, 164. 

 Triton alpestris, cross-fertilization, 26, 



28. 



taeniatus, cross-fertilization, 26, 28. 

 Truncus arteriosus, 153. 



Urodela, anus of, 139, 140. 



closure of blastopore, 139, 140. 



Vagus, near first somite, 148. 



v. la Valette St. George, terminol- 

 ogy, 1. 



Ventricle of heart, 153. 



Visceral-arches, 145. 



Visceral-slits, 145. 



Vitelline veins, 151. 



Vitreous body, 162. 



Vogt, segmentation, 38. 



de Vries, action of nucleus on cell, 

 135. 



