GLOSSARY 439 



Cen'trosome (Kcvrpov, centre ; aw/xa, body), a body found at the centre of the aster 

 or attraction-sphere, regarded by some observers as the active centre of cell- 

 division and in this sense as the dynamic centre of the cell. Under its influence 

 arise the asters and spindle (amphiaster) of the mitotic figure. (Boveri, 

 1888.) 



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

 burger; the central ma.ss of the aster from which the rays proceed and within 

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

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



Chloroplas'tids (xAtupds, green ; TrAao-rds, form), the green plastids or chlorophyll- 

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



Chro'matin (xpw/i^a, colour), the deeply staining substance of the nuclear network 

 and of the chromosomes, consisting of nuclein. (Flemming, 1879.) 



Chro'matophore (xpw/u.a, colour; -</)dpos, bearing), a general term applied to the 

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



plastids. (SCHAARSCHMIDT, 1880: SCHMITZ, 1882.) 



Chro'matoplasm (x/aw/xa, colour; -n-Xdafxa, anything formed or moulded), the sub- 

 stance of the chromoplastids and other plastids. (Strasburger, 1882.) 



Chro'miole. the smallest chromatin-granules which by their aggregation form the 

 larger chromomeres of which the chromosomes are composed. (Eisen, 1899.) 



Chro'momere (^pw/xa, colour; fxipo^, a part), one of the chromatin-granules of 

 which the chromosomes are made up. Identified by Weismann as the "id." 

 See Chromiole. (FOL, 1891.) 



Chromoplas'tids (^pw/xa, colour ; TrAao-rds, form), the coloured plastids or pigment- 

 bodies other than the chloroplasts, in plant-cells. (Schimper, 1883.) 



Chro'moplasts, net-knots or chromatin-nucleoli; also used by some authors as 

 equivalent to Chromoplastid. (Eisen, 1899.) 



Chromosomes (^ptop-a, colour ; a-wfia. body), the deeply staining bodies into which 

 the chromatic nuclear network resolves itself during mitotic cell-division. (Wal- 

 dever, 1888.) 



Cleavage-nucleus, the nucleus of the fertilized egg, resulting from the union of 

 egg-nucleus and sperm-nucleus. (O. Hertwig, 1875.) 



Cortical zone, the outer zone of the centrosphere. (Van Beneden, 1887.) 



Cyano'philou3 (/<mvos, blue ; (^lAeZv, to love), having an especial affinity for blue 

 or green dyes. (Auerbach.) 



Cy'taster (kuVos, hollow (a cell) : aaTrjp. star), the same as Aster, i. See Kary- 

 aster. (Flemming, 1882.) 



[Cy'toblast] (ki^-os, hollow (a cell); ySAao-Tos. germ). i. The cell-nucleus. 

 (Schleiden. 1838.) 2. One of the hypothetical ultimate vital units (bioblasts or 

 "granula") of which the cell is built up. (Altmann, 1890.) 3. A naked cell 

 or "protoblast." (Kolliker.) 



[Cytoblaste'ma] (see Cytoblast), the formative material from whicli cells were 

 supposed to arise by "free cell-formation." (Schleiden, 1838.) 



[Cytochyle'ma] (kvto<;. hollow (a cell) ; x^^Ads juice), the ground-substance of the 

 cytoplasm as opposed to that of the nucleus. (Strasburger, 1882.) 



Cy'tode (ktjtos, hollow (a cell) ; elSos, form), a non-nucleated cell. (Hackel, 1866.) 



Cytodie'resis (/euros, hollow (a cell) ; Staipeo-ts. division), the same as Mitosis. 

 (Henneguy, 188?.) 



Cytohy'aloplasma (kuVos, hollow (a cell) ; uaAos, glass : irXavfjua, anything formed), 

 the substance of the cytoreticulum in which are embedded the microsomes ; 

 opposed to nucleohyaloplasma. (Strasburger, 1882.) 



Cy'tolymph (kuVos, hollow (a cell) ; lyinpha, clear water), the cytoplasmic ground- 

 substance. (Hackel, 1891.) 



