NUCLEAR DIVISIONS IN AMOEBA 45 



EXPLANATION OF PLATE 2. 



Illustrating Dr. Monica Taylor's paper on ' Nuclear Divisions 

 in Amoeba p rot ens'. 



All figures were drawn mth the Abbe camera. 



With the exception of figs. 4 and 8 the material for the 

 drawings was fixed in warm corrosive acetic, and stained in 

 Delafield's haematoxylin. 



Fig. 1. — Resting nucleus. Karyosome in plan. 



Fig. 2. — Resting nucleus. Karyosome in elevation. 



Fig. 3. — Resting nucleus. Karyosome in elevation (daughter product 

 of newly divided nucleus). 



Fig. 4. — Resting nucleus. ' Biconcave ' form of contents (aceto- 

 carmine). 



Fig. 5. — Resting nucleus. Karyosome contracted. 



Fig. 6. — -Resting nucleus. Karyosome rolling over. 



Fig. 7.- — Resting nucleus. Nuclear contents assuming ' biconcave ' 

 form. 



Fig. 8. — Aceto-carmine preparation of nucleus from a spherical amoeba. 



Fig. 9. — Permanent preparation of nucleus from a spherical amoeba. 

 Two pairs of daughter nuclei not completely separated. 



Fig. 10. — Early stage in division of nucleus. Increase in number of 

 chromatin blocks. 



Figs. 11 and 12. — Early stage in division of nucleus. Increase in number 

 of chromatin blocks. Division of karyosome. 



Fig. 13. — ' Lobed ' nucleus — assuming ' biconcave ' condition. Chroma- 

 tin and karyosome dividing. Nuclear membrane beginning to divide. 



Fig. 14. — Complicated nucleus consisting of four incipient daughter 

 nuclei. 



Fig. 15. — Later stages in division. One daughter nucleus with its com- 

 ponent chromatin blocks and karyosome is freeing itself from the other. 

 Karyosome in elevation. 



Figs. 16-19. — Later stages in division. Karyosome in elevation. 



Figs. 20 and 21. — Later stage in division. Karyosome in elevation. 



Fig, 22, — Daughter nuclei almost separate. 



Fig, 23. — Daughter nuclei completely separate, but lying close together 

 in the amoeba. 



Fig. 24. — Daughter nuclei rolling away from each other. Karyosome 

 partly in ' plan ', partly in ' elevation '. 



Figs, 25 and 26. — Stages in division of karyosome (plan). 



