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'matin (see Chromatiii), the non-staining substance of the nucleus, as 



opposed to chro matin : comprising the ground-substance and the linin-network. 



(FLEMMING. 1880.) 



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

 Ale'cithal (d-priv. ; Ae/a#os, the yolk of an egg), having little or no yolk (applied 



to eggs). (BALFOUR, 1880.) 

 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^xf, on both sides; aarrjp, a star), the achromatic figure formed 



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



1877.) 



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

 (SCHWARZ, 1887.) 



Amy'loplasts (a/ruAov, starch ; TrAao-ros, TrAdcro-eii/, form), the colourless starch- 

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



An'aphase (dm, 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.) 



Anther ozo'id, the same as Spermatozoid. 



Aiiti'podal cone, the cone of astral rays opposite to the spindle-fibres. (VAN 

 BENEDEN, 1883.) 



Archiam'phiaster (dp^i = first, + amphiaster), the amphiaster by which the first 

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



Ar'choplasma or Archoplasm (dpxw, a ruler), the substance from which the 

 attraction-sphere, the astral rays and the spindle-fibres are developed, and of 

 which they consist. (BovERi, 1888.) 



As'ter (do-T?7p, 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] (do-TTyp, a star ; KoiAos, hollow), a term somewhat vaguely applied to 

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



As'trosphere (see Centrosphere). i. The central mass of the aster, exclusive 

 of the rays, in which the centrosome lies. Equivalent to the "attraction- 

 sphere" of Van Beneden. (FoL, 1891; STRASBURGER. 1892.) 2. The entire 

 aster exclusive of the centrosome. Equivalent to the "astral sphere' 1 of 

 Mark. ( BOVERI, 1895.) 



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