GLOSSARY 



[Obsolete terms are enclosed in brackets. The name and date refer to the first use of the word; 

 subsequent changes of meaning are indicated in the definition.] 



Achro'matiu (see Chromatin), the non-staining substance of the nucleus, as 

 opposed to chromatin ; comprising the ground-substance and the linin-network. 

 (Flemming, 1879.) 



A'crosome ( aKpov, apex, aiafm., body), the apical body situated at the anterior end 

 of head of spermatozoon. (Lenhossek, 1897.) 



[Akaryo'ta] (see Karyota), non-nucleated cells. (Flemming, 1882.) 



Ale'cithal (d-priv. ; AcKt^o?, the yolk of an egg), having little or no yolk (applied 

 to eggs). (Balfour, 1880.) 



Alloplasma'tic (aAXos. different). Applied to active substances formed by differ- 

 entiation from the protoplasm proper, c.^. the substance of cilia, of nerve-fibrillae, 

 and of muscle-fibrillEe. Alloplasmatic organs are opposed to '' protoplasmatic," 

 which arise only by division of preexisting bodies of the same kind. (A. Meyer, 



1896.) ' .. . . , 



Amito'sis (see Mitosis), direct or amitotic nuclear division; mass-division of 



the nuclear substance without the formation of chromosomes and amphiaster. 



(Flemming, 1882.) 



Am'phiaster (d/x<^t', on both sides; daTvjp, a star), the achromatic figure formed 



in mitotic cell-division, consisting of two asters connected by a spindle. (Fol, 



1877.) 

 Amphipy 'renin (see Pyrenin), the substance of the nuclear membrane. 



(Schwarz, 1887.) 



Amy'loplasts (afJivXov. starch ; TrAao-To's, TrXdaaeLv. form), the colourless starch- 

 forming plastids of plant-cells. (Errera, 1882.) 



An'aphase (dva., back or again), the later period of mitosis during the divergence 

 of the daughter-chromosomes. (Strasburger. 1884.) 



Aniso'tropy (see Isotropy). having a predetermined axis or axes (as applied to 

 the egg). (Pfluger, 1883.) 



Antherozo'id. the same as Spermatozo'id. 



Anti'podal cone, the cone of astral rays opposite to the spindle-fibres. (Van 

 Beneden, 1883.) 



Archiam'phiaster (dpx' = ^''stj + amphiaster). the amphiaster by which the first 

 or second polar body is formed. (WniTiMAN, 1878.) 



Ar choplasma or Archoplasm (dpx<^v- a ruler) (sometimes written arc/i/p/asm), 

 the substance from which the attraction-sphere, the astral rays, and the spindle- 

 fibres are developed, and of which they consist. (Boverl 1888.) 



Arrhe'noid {dpp-qv.. male). The .sperm-aster or attraction-sphere formed during the 

 fertilization of the ovum. (Henking. 1890.) 



As'ter (do-TT/p, a star), i. The star-shaped structure surrounding the centrosome. 

 (Fol, 1877.) [2. The star-shaped group of chromosomes during mitosis (see 

 Karyaster). (Flemming, 1892.)] 



[As'trocoele] {d(TTrip, a star; koiAo?. hollow), a term somewhat vaguely applied to 

 the space in which the centrosome lies. (Fol, 1891.) 



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