334 GLOSSAJiY 



Attraction-sphere (see Centrosphere), the central mass of the aster from which 

 the rays proceed. Also the mass of "• archoplasm," derived from the aster, by 

 which the centrosome is surrounded in the resting cell. (Van Beneden, 1883.) 



[Au'toblast] (ttiiTos, self), applied by Altmann to bacteria and other minute organ- 

 isms, conceived as independent solitary " bioblasts." (1890.) 



Axial filament, the central filament, probably contractile, of the spermatozoon- 

 flageUum. (Elmer. 1874.) 



Basichro'matin (see Chromatin), the same as chromatin in the usual sense. 

 That portion of the nuclear network stained by basic aniline dyes. (Heidenhain, 

 1894.) 



Bi'oblast (/iJt'os. life ; /^Aao-rds, a germ), the hypothetical ultimate supra-molecular 

 vital unit. Equivalent to ^/flj'£'///t', etc. First used by Beale. Afterwards identi- 

 fied b\' Altmann as the "granulum."' 



Bi'ogen {[iLO<i, life; -yeviys, producing), equivalent \o plasonie. etc. (Verwokx, 

 1895.) 



Bi'ophores (liio%. life ; -<^6po%, bearing), the ultimate supra-molecular vital units. 

 Equivalent to the pangcns of De Vries, the plasojiies of Wiesner. etc. (Weismann, 



1893-) 

 Biva'lent. applied to chromatin-rods representing two chromosomes joined end to 



end. (Hacker. 1892.) 

 Cell-plate (see Mid-body), the equatorial thickening of the spindle-fibres from 



which the partition-wall arises during the division of plant-cells. (SxRASBUR- 



GER, 1875.) 

 Cell-sap, the more liquid ground-substance of the nucleus. [Kolliker, 1865 ; 



more precisely defined by R. Hertwig, 1876.] 

 Central spindle, the primary spindle by which the centrosomes are connected, as 



opposed to the contractile mantle-fibres surrounding it. (Hermann. 1,891.) 

 Centriole, a term applied by Boveri to a minute body or bodies (" Central-korn ") 



within the centrosome. In some cases not to be distinguished from the centro- 

 some. (Boveri, 1895.) 

 Centrodes'nius (Kevrpov, centre; Sstr/xo'?. a band), the primary connection between 



the centrosomes, forming the beginning of the central spindle. (Heidenhain, 



1894.) 

 Centrole'cithal (KeVrpoi/, centre ; Ae'/ct^os, yolk), that type of ovum in which the 



deutoplasm is mainly accumulated in the centre. (Balfour. 1880.) 

 Cen'trosome {Kevrpov, centre; (roifjua., body), a cell-organ generally regarded as the 



active centre of cell-division and in this sense as the dynamic centre of the cell. 



Under its infiuence arise the asters and spindle (amphiaster) of the mitotic 



figure. (Boveri. 1888.) 

 Cen'tro-sphere. used in this work as equivalent to the " astrosphere " of Stras- 



burger ; the central mass of the aster from which the rays proceed and within 



which lies the centrosome. The attraction-sphere. [Strasburger. 1892; 



applied by him to the " astrosphere " and centrosome taken together.] 

 Chloroplas'tids (;;^/\,ojpo9. green ; TrAacrro?. form), the green plastids or chlorophyll- 

 bodies of plant and animal cells. (Schimper, 1883.) 

 Chro'matin {)(pwfjLa, colour), the deeply staining substance of the nuclear network 



and of the chromosomes, consisting of nuclein or nucleic acid. (Flemming, 



1880.) 

 Chro'matophore ()(^pwfj.a, colour; -^opos. bearing), a general term applied to the 



colored plastids of plant and animal cells, including chloroplastids and chromo- 



plastids. (Schaarscmmidt, 1880 : Schmitz, 1882.) 

 Chro'niatoplasni (;^pajp,a. colour; TrAacr/xu. anything formed or moulded), the sub- 

 stance of the chromatojjlasts and other plastids. (Strasiu'kger. 18S2.) 



