438 GLOSSARY 



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

 of the rays, in which the centrosome lies, luiuivalent to tiie -attraction-sphere" 

 of Van Beneden. (Foi.. 1891; Stkasi!1'K(;i:k, 1^92.) 2. The entire aster 

 exclusive of the centrosome. Equivalent to the "astral sphere" of Mark. 

 (BovEKi, 1895.) 



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

 the ravs 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] (auVds, self), applied by Altmann to bacteria and other minute organ- 

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



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

 fiagellum. (Eimer, 1874.) 



Basichro'matin (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 {liLO<;. life: fiXa(TT6<i. a germ), a term applied by Altmann to the hypo- 

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

 the ''granulum." 



Bi'ogen (/ito?. life: -yevi/s. producing), equivalent to plasotiie, etc. (Verworn, 



1895-) 

 Bi ophores (/Jt'os. lite: -<^d/30?. bearing), the ultimate supra-molecular vital units. 



Equivalent to Xhcpaiigeus of De \'ries, the p/asomes of Wiesner, etc (Weismann, 



'^93-) 

 Bioplasm (/:?(,o?. irXasfxa). 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.) 

 Bivalent, applied to chromatin-rods representing two chromosomes joined end to 



end. (H.A.CKER, 1892.) 

 Ble'pharoplast (/yXec^apt's, eye-lash or cilium). The centrosome-Iike 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 whicii 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 (K^vrpov. centre; Be<;ix6'i, 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 (Kevrpov. centre : XeVt^os. yolk), that type of ovum m which the 

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



Cen'troplasm (K-eVrpov. centre; TrXda/xa). the protoplasm forming the attraction- 

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

 langer, 1895.) 



