GLOSSARY 



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

 LUDsoiete ^^^^^^^^^^t changes of meaning are indicated m the definition.] 



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

 opposed to chromatin: comprising the ground-substance and the hnm-netwo,k. 



(Flemmixg. 1880.) 

 TAkaryo'ta] (see Karyota). non-nucleated cells. (Flemmixg. 1882.) 



kte cithal (ipriv. : A.'k.^o., the yolk of an egg), having httle or no yolk (applied 

 to eo-o-sV (Balfour. 1880.) . . 



Amito'sls (see Mitosis), direct or amitotic nuclear division; mass-division ot 

 the nuclear substance without the formation of chromosomes and amphiaster. 



AtipMalteM^aJx^?' on both sides; aar^p. a star), the achromatic tigure formed 

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



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



Amyloplasts '[Z^Xov, starch: TrXacrro., 7rU<rauv, form), the colourless starch- 

 forming plastids of plant-cells. (Errara, 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). (Pflijger, 1883.) 



Antherozo'id. the same as Spermatozoid. . „ ^u i\T.^- 



Antipodal cone, the cone of astral rays opposite to the spindle-fibres. (Van 



ArcMam'^phlaB?er \«PX' = first. + amphiaster). the amphiaster by which the first 

 or second polar bodv is formed. (Whitmax. 1878.) 



Ar'choplasma or Archoplasm (oEpX-v. a ruler), the substance from which the 

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

 which thev consist. (BovERi, 1888.) ..„.,.n=nmP 



As'ter (d.aTy]p a star), i. The star-shaped structure surrounding the centrosome. 

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

 Karyaster). (Flemmixg, 1892.)] , , r 1 f, 



[As troccele] (aar.jp, a star; ko\Xo,. hollow), a term somewhat vaguely applied to 

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



As'trosphere (see Centrosphere). i. The central mass ot th^'-^^^er exclusive 

 of the ravs. in which the centrosome lies. Equivalent to he " ^Urac on- 

 sphere^' of Van Beneden. (FoL. 1891 ; Strasburger, 1892.) 2. The entnc 

 aster exclusive of the centrosome. Equivalent to the -astral sphere of 

 Mark. (Boveri. 1895.) 



