142 



INDEX AND GLOSSARY 



most obvious during nuclear 

 division, 93. 



Cerianthus, experimental het- 

 erornorphoses, 51. 



CHABRY, destruction of segmen- 

 tation sphere, 62. 



Chromatin, a material found 

 in the nucleus of cells, so 

 called because it absorbs 

 stains with avidity : germ- 

 plasm and, viii, xiv ; relation 

 of, to specific character of 

 cells, 36, 37. 



Chromosomes, definite, visible 

 bodies, as which the chroma- 

 tin of a dividing nucleus 

 appears, xiv, 93. 



Crystal, growth of, compared 

 with organic growth, 108. 



Cione, experimental hetero- 

 morphoses, 52. 



Clavelliiia, reproduction from 

 buds, 46. 



Cleavage - planes, the planes 

 separating the daughter- 

 nuclei, or daughter-cells, in 

 the early division of a fer- 

 tilised egg-cell, xvii ; relation 

 between appearance of, and 

 structure of eggs, 95. 



Coelenterata, a major division 

 of multicellular animals, in- 

 cluding such creatures as 

 sea-anemones, corals, and 

 jelly-fish, 46. 



Continuity of the germplasm, 

 26. 



Continuity of life, the doctrine 

 opposed to spontaneous gene- 

 ration, 2. 



Correlations, 118, 121. 



D 



DARWIN, pangenesis, 21. 

 Determinants. Each id of 



germplasm is supposed by 

 Weismann to be composed 

 of minor pieces, arranged in 

 a complicated fashion that 

 is the result of the past 

 history of the species. For 

 every part of the body, large 

 or small, that may be dif- 

 ferent in different individuals 

 or species, there is, at least, 

 one determinant in the id. 

 The determinants are so 

 grouped in the id that they 

 are liberated and become 

 active when the time comes 

 for the development of that 

 part of the body they con- 

 trol, viii, 22 ; arguments 

 against, 82; relation to cells, 

 87. 



Determinates, the smallest 

 parts of an organism which 

 vary independently, and 

 which are supposed by Weis- 

 mann to be represented in 

 the germplasm by special 

 pieces, 23, 25. 



Differentiating division, such a 

 division of the nucleus as 

 would result in daughter- 

 nuclei unlike each other, and 

 unlike the parent nucleus. 

 The qualities of the parent 

 nucleus are supposed to have 

 been distributed between the 

 daughter-nuclei, xi ; absence 

 of visible evidence for, xv, 

 25 ; objections to occurrence 

 of, 34, 78. 



Dimorphism, the appearance 

 of the same species in two 

 different forms, sexual di- 

 morphism, 122, 124. 



Disharmonic union in graft- 

 ing, 70. 



