CYTOLOGICAL CHANGES PRODUCED IN DROSERA. 203 



Further Study of Cytological Changes produced 

 in Drosera. 



Part II. 



By 



Lily 11. Hiiic, 



Pliysiolofrical Laboratory', Oxford. 



With Plate 22. 



This research is an expansion of that previously undertaken, 

 of which an account has been given in this Journal, vol. 39. 



Aims. 



The present aim was to ascertain — 



(1) Whether substances which diflFer chemically will produce 

 specific alterations in either the cytoplasm or the nucleus. 



(2) To what extent the cytoplasm and the nucleus are 

 interdependent. 



(3) Whether the rapidity with which changes occur depends 

 on the ease with which substances are absorbed. 



(4) The relation between cytological changes and the irri- 

 tability of leaves, the latter being calculated from the rate of 

 closure of the tentacles. 



(5) What efi'ects can be produced by bringing healthy cells 

 in contact with supposed waste products of ordinary metabolic 

 activity. 



