124 



INDEX 



Cell-division, 52 sqq. ; Ascaris, 11, 

 86 ; in diagrammatic form, 14 ; at 

 low temperatures, 68 ; see Segmen- 

 tation. 



Cell lineage, 12, 68. 



Cell volume, 55. 



Cells, enucleate, 46 ; potentialities'of 

 isolated, 74 ; ratios of volumes of, 

 56. 



Centrifuged eggs, 74, 76, 78, 80, 82, 84. 



Centrolecithal, see Egg-structure. 



Centrosome, 29, 31 ; division of, 24, 

 27 ; function of, 89; origin in par- 

 thenogenetic eggs from o nucleus, 

 45, 46. 



Cephalopod, 27. 49, 69. 



Cerebratulus, apical sense-organ of, 

 76 ; compression of egg, 72 ; effect 

 of calcium-free sea- water on eggs 

 of, 66, 77 ; effect of pressure on 

 egg-axis, 76. 



Cerfontaine, P., 69, 72. 



Chaetopterus, artificial partheno- 

 genesis, 40 ; centrifuged eggs of, 

 82 ; cross- fertilization, 97 ; differ- 

 entiation in eggs without cleavage, 

 69. 



Chloride of sodium, magnesium, 

 potassium, 38 ; of calcium, 49, 66, 

 94; of magnesium, 110. 



Chloroform and membrane forma- 

 tion, 39. 



Chlorostoma, 95. 



Chromatin, diminution in Ascaris, 11, 

 13 ; elimination of, 96, 97. 



Chromosomes, alteration of number, 

 11, 23, 27, 53; behaviour in arti- 

 ficial parthenogenesis and cross- 

 fertilization, 103 ; differences in, 

 89, 93 ; diminution of, 11, 13, 74 ; 

 division of, 33, 47 ; distribution of, 

 in dispermic eggs, 90 (fig.), 93 ; 

 elimination of, 106, 107; hetero- 

 typic, 23, 25 ; in inheritance, 108 ; 

 numbers in dispermic eggs, 53, 87 ; 

 number in monaster eggs, 53 ; 

 ratios of volumes, 56, 57 ; various 

 size and form of heterochronio- 

 somes, 94. 



Cleavage, see Segmentation. 



Coefficient of correlation, 22, 62 ; of 

 variability, 21. 



Coelenterates, 27. 



Cold, artificial parthenogenesis, 40. 



Conjugation, Infusoria, 33. 



Conklin, E. G., 56, 69, 72, 86, 99. 



Cornea, formation in Amphibia, 110. 



Correlation, coefficients, trout larvae, 

 22 ; and development, 23 ; between 

 first furrow and sagittal plane, 62, 



65 ; between growth and varia- 

 bility, 21 ; between symmetry and 

 sagittal planes, 62, 65. 



Crampton, H. E., 67. 



Crepidula, 58, 99 ; centrifuged eggs 

 of, 83, 86. 



Crinoid, Antedon in cross-fertiliza- 

 tion, 95. 



Cross-fertilization, see Hybridization. 



Ctenolabrus, 97. 



Ctenophora, 50, 68, 73 ; isolated 

 blastomeres, 73. 



Cumingia, centrifuged eggs of, 82. 



Cyclops, centrifuged eggs of, 83. 



Cynthia partita, centrifuged eggs 

 of, 83, 86 ; development of, 35 

 (fig.) ; half and three-quarter em- 

 bryos of, 75 (fig.) ; maturation in, 

 34 ; pigmentation of eggs of, 34 ; 

 volume of nuclei in, 59. 



Cy tasters in parthenogenetic eggs, 45. 



Cytolysis, 39, 41. 



Cytoplasm, change in structure, 34 ; 

 characters transmitted by, 98, 108 ; 

 deposit of yolk granules in, 24 ; in 

 egg-fragments and isolated blasto- 

 meres, 76 ; heterogeneity of, 88 ; 

 measurement of volume of, 57 ; 

 organ-forming substances in, 70, 

 107 ; part played by different 

 regions, 86 ; physical properties 

 of, 69 ; removal of part of, 72 ; 

 streaming movements in, 65 ; 

 structure of, 71, 74. 



Davenport, C. B., 15. 



Debaisieux, G., 106. 



Delage, Yves, 40. 



De Morgan, W., 105. 



Dentalium, apical organ of, 73, 76 ; 

 cross-fertilization, 97 ; isolated 

 cells of embryo, 67 (fig.) ; removal 

 of polar lobe, 67. 



Determinants, 59, 66, 86, 88, 98. 



Development, abnormality of, due 

 to irregular distribution of chromo- 

 somes, 93 ; of Ascaris megalo- 

 cephala, 11 ; of centrifuged eggs, 

 78 sqq. ; of definitive centrosomes, 

 29, 32 ; of dispermic eggs, 86, 91 ; 

 effect of derangement of cytoplasm 

 upon, 80 ; of egg- fragments, 73 ; 

 of isolated blastomeres, 76 ; of par- 

 thenogenetic eggs, 40 sqq. ; of 

 Ran a temporaria, 8 sqq.; of 

 Strongylocentrotus lividus, 2, 3 

 (fig.) ; three distinct processes in, 2. 



Developmental capacities of cells, 

 67, 73. 



Differentiation, 2, 10, 11 ; causes_of, 



