268 



N. YATSU. 



Fig. I. Egg cut at an anaphase (10 A.M.) drawn at the twc-cel! stage ; enucleated fragment on 

 the right. Kig. 2. The same drawn at 1.25 P.M. Fig. 3. Egg cut horizontally at an ana- 

 phase (4.3 P.M.) ; enucleated fragment below. Fig. 4. Enucleated fragment dividing, (4.10 P.M.) 

 Fig. 5. The same divided, (7 P.M.) Fig. 6. Egg cut at the two-cell stage (10.40 A.M.) 

 drawn at the four-cell stage (10.55 A.M.) Fig. 7. Enucleated fragment just cutoff (10.40 A.M.) 

 Fig. 8. The same at 1.45 P.M. Fig. g. Eeg cut horizontally at the two-cell stage (12.10 

 P.M.) ; enucleated fragment below. Fig. 10. Enucleattd fragment drawn nearly an hour after 

 the operation. All the drawings X IQO. 



