120 ON SOME PROTEIN CRYSTALLOIDS. 



of fifty such cells examined in the ovary of a bud of 5 millemetres 

 in length there were : — 



Nuclei with more than two nucleoli ... 19 

 Nuclei with two nucleoli ... ... 26 



Nuclei with only one nucleolus ... 5 



None of them showed erythrophilous bodies external to the 

 nucleus. Out of fifty cells from the ovary of an opening flower 

 there were : — 



Nuclei with more than two nucleoli ... o 

 Nuclei with two nucleoli * ... ... 6 



Nuclei with only one nucleolus ... 44 



All these cells showed the little crystalloids. 

 Undoubtedly, in this case, the number of nucleoli in the indi- 

 vidual cells is diminished to some extent by cell multiplication : 

 and, if there is really any connection between the crystalloids and 

 nucleoli, this may account for the small size of the crystalloids in 

 these cells. 



Belong long I hope to carry out some investigations on living 

 material ; and also to extend the research to the ovaries of allied 

 plants. The only one of these, which, owing to the time of year, 

 I have been able to procure as yet — Hyacinthus orientalis albulus — 

 was forced in a greenhouse, and shows in the hair-cells of a mature 

 ovary, and in some other cells of the ovarian wall cubical crystal- 

 loids like those of the potato tuber, but 1 have not had the oppor- 

 tunity of investigating the history of these crystalloids as yet. 



In conclusion, I gladly avail myself of this opportunity to 

 acknowledge my deep obligation to Dr. Gustav Mann for his 

 constant and invaluable help throughout the preparation of this 

 paper. 



EXPLANATION OF PLATE V. 



Ml the figures were draimi with the help of Zeiss' s camera lucida, the 

 paper being placed on the table and inclined at an angle of 20°. Except 

 for Figs. 1 and 13, Leitzs l/12th oil immersion objective teas used ivith 

 Zeiss's No. 4 ocular. For Figs. 1 and 13 Leitzs l/12th oil immersion 

 objective with Zeiss s ocular No. 2 was employed. 



List of Abbkeviations. — a, Cell showing senescence. 6, Withered 

 cell, c, Burst cell, pr.. Protoplasm, h., Nucleus, vd. Nucleolus, 

 e., Endonucleolus. ■)?., Vacuole, n.y., Nuclear vacuole, cr. , Crystal- 

 loid, crli. , Granular crystalloids. 



