Knight — 50 — Dictionary 



Endosome. — A karyosome; a vague term meaning a chromo- 

 some, a special form of nucleolus or even a nucleus. 



Endosperm. — Triploid nutritive tissue arising by "double 

 fertilization" by a second male nucleus of two of the eight 

 nuclei of the embryo-sac. 



Energic Nucleus. — A nucleus which is not dividing; resting 

 nucleus. 



Energic Stage. — Metabolic stage, q.v. 



Energid. — The nucleus and cytoplasm of a single cell. 



Enneaploid. — Having nine times the haploid number of 

 chromosomes. 



Entelechy. — A hypothetical principle controlling purposive 

 adaptation and evolution. 



Entomogamous. — Pollinated by insects. 



Entomophilous. — Pollinated by insects. 



Entoplasm. — Endoplasm, q.v. 



Entosphere. — The central portion of the centrosphere. 



Enucleate. — Without a nucleus by reason of its removal by 

 mechanical means. 



Enucleation. — Removal of the corpus luteum. 



Environment. — The collective term for all the influences 

 affecting the life, growth, health and activity of organisms. 



Environmental Variation. — An acquired character: a non- 

 heritable variation caused by the reaction of the individual to 

 an environmental change. 



Epacme. — The phase in the development of a group, species 

 or individual when vigour is still increscent. 



Epharmonic Convergence. — Morphological and anatomical 

 similarity between systematically unrelated, or only distantly 

 related, plants. 



Epharmosis. — Organic adaptation to a changed environment. 



Epibiotic Species. — Endemic species that are relics of a 

 "lost" flora and compose a minor portion of the biota of most 

 regions (Cain, 1944). 



Epididymis (pi. Epididymi). — A coiled duct of variable 

 length (from a few feet to several hundred feet, according 

 to species) into which the developing spermatozoa are con- 

 veyed from the seminiferous tubules and efferent ducts of 

 the testis. Spermatozoa pass through the epididymi to the 

 vasa deferentia and thence to the urethra. 



Epigamic. — (i) Of colouring, plumage, etc.; attractive to 

 the other sex. (ii) Promoting the union of gametes. 



Epigamic Selection. — See under Selection, Epigamic. 



