Knight — 12 — Dictionary 



Archiplasm. — The protoplasm which makes up the spindle 

 fibres and astral rays. The chromophobic portion of the 

 Golgi apparatus. 



Archoplasm. — Archiplasm, q.v. 



Armogenesis. — Adaptation on the part of the embryo. 



Armogony. — Armogenesis, q.v. 



Aromorphosis. — Large changes of general adaptive signifi- 

 cance which do not restrict the possibilities of life of the type 

 (de Beer). 



Arrhenogenic. — Producing offspring consisting entirely, or 

 almost entirely, of males. N. Arrhenogeny. 



Arrhenoplasm. — Male protoplasm, as distinct from female 

 protoplasm or thelyplasm. 



Arrhenotoky. — Production of males by parthenogenesis. 



Arrhostia. — Any physical condition, arising as a result of 

 evolution, which simulates a diseased state. Adj. Arrhostic. 



Arrhostic. — See Arrhostia. 



Artefact, Artifact. — Any structure or appearance which is 

 not typical of the actual specimen, but which results from 

 laboratory or other treatment. 



Artenkreis. — A circle of related species that show a geo- 

 graphical replacement pattern (Cain, 1944). 



Artificial Insemination. — The introduction of spermatozoa 

 into the uterus (or vagina) by mechanical means without 

 coitus taking place. 



Artificial Parthenogenesis. — The induction of develop- 

 ment of an unfertilized ovum by chemical or physical stimula- 

 tion. 



Aschheim-Zondek Test. — A pregnancy test based on the 

 stimulation of the development of the ovaries of an immature 

 mouse following injection into the mouse of urine from a 

 pregnant woman. 



Ascorbic Acid, — Vitamin C: hexuronic acid, C„H„0« ; a 



. • 'boo' 



water-soluble, anti-scorbutic vitamin. 



Asexual. — Lacking functional sexual organs, sexless, without 



sex. 

 Aspermia. — The state of being devoid of semen. 

 Assortative Mating. — A tendency for like to mate with like. 

 Assertive Mating. — Assortative Mating, q.v. 

 Assortment. — The separation of genes, or of chromosomes, of 



maternal and paternal origin at meiosis. 

 Aster. — (i) The radial, star-like, protoplasmic striations 



which surround the centrosome during cell division, (ii) Used 



