Bcospecies — 49 — Endosare 



Embryo Culture. — A method of inducing growth of em- 

 bryos artificially. The technique is of value in obtaining pro- 

 geny from interspecific crosses in which the partially developed 

 embryos normally abort, and it consists in excising the young 

 embryos under aseptic conditions and placing them on suitable 

 nutrient media. 



Embryogeny. — The development of a zygote into an embryo. 



Embryology. — The study of embryos and of anything affect- 

 ing embryos. 



Embryonic. — Of cells: not differentiated nor specialized. 



Embryo-sac. — The female gametophyte formed by division 

 of the megaspore. 



Embryo-sac Mother-cell. — A cell of hypodermal origin 

 which undergoes a tetrad division to form four cells one of 

 which develops into the embryo-sac or megaspore. 



E-M-C. — Embryo-sac Mother-cell, q.v. 



Emmenin. — An oestrogen, probably oestriol glucuronide, 

 present in the placenta. 



Encasement. — An extension of the theory of preformation 

 which supposed that, if the seed contained a complete minia- 

 ture of the organism of the next generation, this miniature 

 must itself contain seed, i.e. miniatures of the organisms of a 

 generation still further ahead and so ad infinitum. 



Enchylema. — The cell sap; the more fluid constituents of a 

 cell. 



Endemic. — Confined to a small section of the country, e.g. 

 endemic species. 



Endogamy. — (i) Self-pollination, (ii) Inbreeding, (iii) 

 union of two sister female gametes. 



Endogenous. — Of internal origin; growing from within. 



Endomitosis. — A division process in which chromosome dou- 

 bling occurs unaccompanied by nuclear division, spindle for- 

 mation or chromosome movement and in which the nuclear 

 membrane remains intact. 



Endomixis. — A process of self-fertilization sometimes seen 

 in Paramaecium, in which the sperm and ^gg nuclei, from 

 the one individual, unite. 



Endoplasm. — The granular inner portion of the cytoplasm ; 

 endosare. 



Endopolyploidy. — The division, or repeated division, of the 

 chromosomes of a cell without the nucleus or the cell itself 

 dividing. 



Endosare. — Endoplasm, q-.v. 



