STUDIES OF REPRODUCTIVE ELEMENTS: I. 19 



sphere.^ of nttrnction nre found at the two poles of the plaiie of contact 

 of the nuclei, which appear to he more or Jess elongated. 



Tlic sections represented hy tigs. 46-55 were all taken from 

 eggs kilJed with hot 30 ^/o alcohol to vsdiicli a few drops of sublimate 

 liad hcen added. Tlie chromatic elements and the attractive spheres 

 are tolerably well to l)e seen, but the central l)ody is not so clear 

 as in the eo'îi's killed with the incro-acetic acid sohition. Fig-, 

 46 sliows the two nuclei close to one anothci-. and the central 

 ])odies rather fartlieraway from the nuclei tlian in the case represented 

 bv tig. 45. Xumer(His aehi-oniati** tibres are also well to be seen 

 exteri<ling l)etween the central bodies and the nuclei, in which are 

 seen eight single chromosomes. In fig. 47 which is nearly in the 

 saine stage as the one ^represented by fig. 46, the eight clnvimatic 

 elemerits are more elongated. The achromatic fibres from the attractive 

 sphere on the right of the figure are attached to ])()th tlie nuclei, but 

 those from the other sphere of attraction are connected oidy with 

 one of tliem, which tlierefore seems to lie nearer than the other to 

 tliat sphere of attraction. This is more clearly seen in fig. 48, Avhere 

 we find the nucleus lying above in the figure to be pulled more by the 

 central body on the right hand side, and that situtited below more 

 by the one on the left. The nuclear membrane, moreover, seems to 

 have been dissolved at tlie pole where the aclu'omatic til)res are 

 attached. The eiHit more or less elon^'ated chromatic l)0(lies a.re seen 

 in each of the nuclei. In tig. 49 both the nuclei are ])uiled equally by 

 the central Ijodies and the chromatic elements are f )nnd lying at the 

 centre of the spindle, whose achromatic tibres are now found indis- 

 tinctly within tlie nuclei. The nuclear membrniie is, howeven*, still 

 present except at tlie ])lace of their contact. Fig. 50 shows a cross 

 section of the nuclei in cojnilation as i.; rejn'esented by tig. 49. In 

 tig. 51 the nuclear memljrane has entirely disappeared, but the chro- 



