438 



GLOSSARY 



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

 of the rays, in which the centrosome Hes. 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] (avrds, 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. (Elmer, 1874.) 



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

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



1894.) 



Bi'oblast (/3tos, life : ^Aao-ro'g. 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 {fiio^, life ; -yei/?;?, producing), equivalent to plasome, etc. (Verworn, 



1895-) 

 Bi'ophores (/^tos. life ; -<f>6po^, bearing), the ultimate supra-molecular vital units. 



Equivalent to the pangens of De Vries, the plasomes of Wiesner, etc. (Weismann, 



1893.) 

 Bi'oplasm (^to9, 7rXa?/xa). 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 (/:^A£c/)apt9, eye-lash or cilium). The centrosome-like bodies in 



plant-spermatids in connection with which the ciha 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 (KeVx/oov, centre; Ses^o?, 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 (KcVrpov. centre : Acki^os, yolk), that type of ovum m which the 



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

 Cen'troplasm (Kevrpov. centre; irXdo-fxa), the protoplasm forming the attraction- 

 sphere or central region of the aster ; the substance of the centrosphere. (Er- 

 langer, 1895.) 



