Cuav. Ill. THE PROCESS OF AGGREGATION. 41 
D, namely, the formation of an extremely minute 
sphere at one end of an elongated mass. This rapidly 
increased in size, as shown in E, and was then re- 
absorbed, as at F', by which time another sphere had 
been formed at the opposite end. 
The cell above figured was from a tentacle of a dark 
red leaf, which had caught a small moth, and was 
examined under water. As I at first thought that the 
movements of the masses might be due to the absorp- 
tion of water, I placed a fly on a leaf, and when after 
18 hrs. all the tentacles were well inflected, these were 
examined without being immersed in water. The cell 
Fie. 8. 
(Drosera rotundifolia.) 
Diagram of the same cell of a tentacle, showing the various forms successively 
assumed by the aggregated masses of protoplasm. 
here represented (fig. 8) was from this leaf, being 
sketched eight times in the course of 15 m. These 
sketches exhibit some of the more remarkable changes 
which the protoplasm undergoes. At first, there was 
at the base of the cell 1, a little mass on a short 
footstalk, and a larger mass near the upper end, and 
these seemed quite separate. Nevertheless, they may 
have been connected by a fine and invisible thread of 
protoplasm, for on two other occasions, whilst one 
mass was rapidly increasing, and another in the same 
cell rapidly decreasing, I was able by varying the 
light and using a high power, to detect a connecting 
thread of.extreme tenuity, which evidently served as 
