GLOSSARY. 



Acquired characters. — See Somatogenetic characters. 



Amphigony (Hackel). — Sexual reproduction. 



Amphimixis (Weismann). — The mingling of the hereditary substances 

 of two individuals in an act of sexual union. 



Ancestral germ-plasm. — See p. 123. 



Asexual Beproduction. — In which there is no liberation of special 

 germ cells containing the potentiality of the adult organism, but 

 in which the same object is effected by the liberation of buds, over- 

 growths, &c, which develop into the parent form. There are 

 many forms of asexual reproduction. 



Atavism. — The abnormal occurrence in existing species of characters 

 which were peculiar to ancestral species, e.g., see Dartvin and 

 after Darwin, 2nd ed., Part I, p. 94. 



Biophore. — See p. 123. 



Blastogenetic characters. — See Plasmogenetic characters. 



Calyx. — The outermost covering of the flower, which protects it before 

 opening. Its position and precise function vary. 



Cell nucleus. — A spherical or ovoid body embedded in the cell proto- 

 plasm, which has important functions in cell division and in repro- 

 duction. It consists of chromatin and achromatin. There are often 

 several nuclei in one cell, whilst some cells have not been shown to 

 have a nucleus at all. 



Cassation of Selection (Bomanes). — See Fanmixia. 



Chromatin threads. — Immediately before a cell divides the nucleus is 

 resolved into chromatin fibres or threads and an achromatin matrix. 

 These chromatin fibres are then marshalled into either rods or loops, 

 &c, as the division of the cell proceeds (see Darzuin and after 

 Darwin, figs. 36, 37, and 38). Subsequent changes in the threads 

 conclude the division (for a description of which consult the account 

 above) . 



Chromosomes. — See Chromatin threads. 



P 2, 



