438 GLOSSARY 



As'trosphere (see Centrosphere) . K 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" of Mark. 

 (BOVERI, 1895.) 



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] (avVos, 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- 

 flagellum. (EIMER, 1874.) 



Basicnro'matiii (see Chromatin), the same as chromatin in the usual sense. 

 That portion of the nuclear network stained by basic tar-colours. (HEIDENHAIN, 

 1894.) 



Bi oblast (/?ibs, life ; /?AaoTos, a germ), a term applied by Altmann to the hypo- 

 thetical ultimate vital unit (equivalent to plasome), and identified by him as 

 the "granulum." 



Bi'ogen (/ftb?, life ; -ycvrys, producing), equivalent to plasome, etc. (VERWORN, 

 1895.) 



Bi ophores (/2ios, life ; -<opos, bearing), the ultimate supra-molecular vital units. 

 Equivalent to \hzpangens of De Vries, thzplasomes of Wiesner, etc. (WEISMANN, 

 1893.) 



Bi'oplasm (/Sios, 7rXas/>ta). The active "living, forming germinal material," as 

 opposed to "formed material." Nearly equivalent to protoplasm in the wider 

 sense. (BEALE, 1870.) 



Bi'oplast, equivalent to cell. (BEALE, 1870.) 



Bi'valent, applied to chromatin-rods representing two chromosomes joined end to 

 end. (HACKER, 1892.) 



Ble pharoplast (j3\t<j>dpL<s, eye-lash or cilium). The centrosome-like bodies in 

 plant-spermatids in connection with which the cilia of the spermatozoids are 

 formed. (WEBBER, 1897.) 



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

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

 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, 1891.) 



Cen'triole, 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'mus (/ceVrpov, centre ; Scs/xo?, a band), the primary connection between 

 the centrosomes, formed by a substance from which arises the central spindle. 

 (HEIDENHAIN, 1894.) 



Centrodeu'toplasm, the granular material of the testis-cells which may contribute 

 to the formation of the Nebenkern or to that of the idiozome. (ERLANGER, 

 1897.) 



Centrole'cithal (/cevrpov, centre ; Aeiaflos, yolk), that type of ovum in which the 

 deutoplasm is mainly accumulated in the centre. (BALFOUR, 1880.) 



Cen'troplasm (/cevrpov, centre ; TrAaoy-ta), the protoplasm forming the attraction- 

 sphere or central region of the aster ; the substance of the Centrosphere. (R- 



LANGER, 1895.) 



