210 EIOHARD ASSHETON. 



sixteen to twelve. A curved band of them connects the two 

 polar groups. 



The six-segment specimen which I possess was found in the 

 upper part of the Fallopian tube of a sheep killed upon the 

 third day. It was examined in the liquid from an ovarian 

 follicle and drawn while fresh (fig. 25). It was composed of 

 two large segments and four small segments. 



I could not make out that there was any difference in the 

 nature of the segments, either while fresh or after treatment 

 with Flemming's fluid and carmalum. The four small segments 

 were nearly of equal size. One of the large segments was 

 appreciably larger than the other (v. fig. 25). 



The relative sizes of the six segments may be gathered from 

 the following figures, the result of measurement while it was 

 still fresh in the follicle liquid : 



15 X 16 



15 X 16 n._._, *_ (21 X 21 



22 X 23 



1 15 X 16 C ' 



Four small segments I i^ ^ i^ "^"^^ ^^"^Se segments | ; 



( 16 X 16 



Fig. 4 is a section passing through two of the small and the 

 two large segments. The two latter appear to be upon the 

 point of division. 



I cannot clearly recognise any yolk- like spheres such as 

 those described in fig. 3. Unfortunately the specimen is more 

 deeply stained than the other. In the two large segments 

 there are some larger looking bodies of more irregular shape, 

 which may be something of a similar nature. 



From the same oviduct I obtained another embryo, which 

 was in eight segments. This was placed at once into chromic 

 acid, where it remained for four hours. It was then stained 

 with carmalum, cut, and mounted. 



As regards size the segments do not differ greatly ; there is, 

 however, one segment which differs most markedly in texture 

 and in colour from all the remainin<i; seven. The whole 

 appearance is of very much lighter colour. The minute 

 structure is finer, and the protoplasm has a tendency to shrink 

 I'rou) its walls, which in other segments it has not. 



