STUDIES OF REPRODUCTIVE ELEMENTS: T. .^.S 



has already disappeared nnd tlie ci'o-lit clnvnnosomes lie in a. ring. 

 Figs. 26-28 were treated with lii)t-alcohol-.sul)liiiiate and the achro- 

 matic fibres are not to be seen. In tig. 29 tlie achromntic fibres are 

 well represented. All draivn witli Seiberî^ Y^'TT"^^*^*^- 



Fifi. SO. — .\ small snperficiïil portion of aii egg, just after the 

 fni'ination of the tirst polîir Ijody, and the second poLu* spindle is seen 

 from a pole. Eight short cliromatic elements are seen in a plane at the 

 e<[uat<)i- of the spindle which is not represented in the figure. Seibert 

 VVII-850. 



Figs. 31, 32. d'-SS. — llepresent tlirce sections in which the second 

 polar spindle ;md a spermatic nucleus wre present in the egg, and in 

 relatively different positions. In nil iiu^ spindles the fonr chromosomes 

 are more or less distinctly to be seen, b'igs. 31 and 32 are drawn 

 by Seibert VV = 330 times, nnd fig. 33 by Seibert VVII = 850 times. 



Figs. 34 é 35. — Division of the second polnr spindle is nearly com- 

 plete, and the egg-nucleus has swollen up a little. The four chromo- 

 somes are now more or Jess elongate 'd. I'.otli drawn with v^eibert 

 VVII = 850. 



Fig. 36. — Piece of an egg in wliich the second polar body, the 

 egg nucleus, and the spermatic luideus wve present. The four chromo- 

 somes in the egg-nucleus are nuich elongated and jue joined togethei- 

 by " Lininfaden." The spermatic nucleus is now much larger than 

 the egg- nucleus. Seibert Y ¥11^^850. 



Fig. 37. — The copulating nuclei out of an egg, the larger of 

 which represents tlie spermatic and the smaller the egg nucleus. At 

 one pole of the egg-nucleus is seen a small central body with an 

 " archoplasma " around it. Seibert 7 VI [ = 850. 



Figs. 38-55. — Represent various stages of copulation and the first 

 segmentation spindle of an egg. In tig. 38 is seen the second polar 

 body at the left hand upper corner. Tlie two nuclei are approaching 



