30 



the protoplasmic body of the cells of certain plants in two halves, 

 one of which contained a nucleus and the other lacked this. This 

 was done by plasmolytic agencies. Ilaberlandt undertook to find 

 out whether some such action did not take place in certain cases 

 without artificial agency. The first objects of study were the 



hairs of different Cucurbitaceae. 



In the short hairs of Bryonia leaves it was found that fre- 

 quently in the process of the secondary cell wall thickening, as it 

 is called in Germany, the protoplasmic body was separated in two 

 halves, about equal. The one contained a nucleus, the other was 

 without one. Now, when new cellulose coats were formed, only 

 that part of the protoplasm containing a nucleus was found to 

 participate in this process. Even when the cellulose ring did not 

 form an entire wall, but grew toward the center of the cell so far 

 as to nearly separate the two portions of protoplasm, that portion 

 containing the nucleus had the power of making a new cellulose 

 coat, so as to entirely encase itself from the other half. Also, in 

 hairs whose whole length was covered by a cell wall of nearly 

 uniform thickness, the protoplasmic body was often separated in 

 two unequal portions, by the part holding the nucleus surrounding 

 itself with one or more cellulose coats. This, he says, is exactly 

 analogous to the process occurring in the bast cells of Asclepiadea^ 

 and Apocynacese, as described by Krabbe. He traced the same 

 occurrence in the hairs on the under side of the leaves of Sicyos 

 angidatiis and Momordica Elatcrium, The encasing in cellulose 

 does not depend on the size of the protoplasmic body, but on its 



possession of a nucleus. 



In the work referred to by Krabbe, the author compares this 

 process of cell-formation within a cell to the formation of asco- 

 spores, and in this later work by Haberlandt this view appears 

 to be fully established. The work of Krabbe was done to 

 prove certain theories in regard to the manner of growth of cell 

 wall, and, as such, deserves a separate review. The work of 

 Haberlandt, on the other hand, has special reference to the action 

 of the nucleus in the formation of new membrane, E. L. G, 

 Capture of ijisects by Utriciilaria, 



In the '* Berichte der Deutschen Botanical Gessellschaft," is 

 an article by M. Biisgen, on the manner and meaning of the 

 capture of insects by {Jtrkularia viUgaris. 



