GARY X. CALKINS. 



PLATE II. 



FIG. 13. a. vegetative c.-ll cut in zone 3; />. fragment three days after the oper- 

 ation; c, a<ymm<?trical division on the fourth day; ,1. same on^the'"seventh'day; e, 

 same on thr eighth day. Dead on the ninth day. Kxpriimnu 23. Table III. 



FIG. 14. a, vegetative cell cut in zone 2; b, fragment 3 days after the operation; 

 c, monster from asymmetrical division on the fourth day; <l. -ame on the fourteenth 

 day. Dead on the seventeenth clay. Experiment 5, Table II. 



FIG. 15. a, vegetative cell cut in zone 3; b, asymmetrical division of the frag- 

 ment on the following clay; c, d, normal and abnormal cells resulting from the 

 division; e, monster formed by the cell don the third day after the operation. Dead 

 on the fifth day with nuclear apparatus normal. Experiment 17, Table II. 



FIG. 16. a, vegetative cell cut obliquely in zone 2; b, asymmetrical division of 

 the fragment 24 hours later; c, d, abnormal and normal cells resulting from tin- 

 division; e, abnormal cell c on the fourth day;/, g, normal cells resulting from normal 

 ti-Mon of d on the third day; h, monster formed from e on fifth day; i. second at- 

 tempted division of the monster on the the sixth day; j, same monster after fixation 

 and staining on the ninth day. Experiment 22, Table 1 1 . 



FIG. 17. a, vegetative cell cut in zone 2; b, attempted division of the fragment 

 48 hours after the operation; c, same monster on the seventh day, 24 hours n'.i<\ 

 addition of nuclein; d, same monster on the ninth day after a second (double) at- 

 tempted division; e, free, truncate fragment derived from the upper extremity of 

 the monster figured in d; f, g, two monsters -derivi-d from the division of monster d 

 at the middle point (x) on the tenth day; in / the lower branch is in the process of 

 division; h, small, reversed, truncate fragment 24 hours after being formed from 

 division of the lower branch of/; i,j, the two monster- on tin- eleventh day; k, the 

 smaller monster after fixation and staining on the fourteenth day; /, the larger sister 

 monster after fixation and staining on the twentieth day alter the original operation. 

 Experiment 40, Table II. 



