58 DROSERA ROTUNDIFOLIA. Chap. TIL 



still contained did not undergo aggregation any more 

 than that which had exuded. In these specimens, as 

 I may add, the individuality of the life of each cell 

 was well illustrated. 



A full account will be given in the next chapter of' 

 the effects of heat on the leaves, and I need here only 

 state that leaves immersed for a short time in water at 

 a temperature of 120° Fahr. (48°-8 Cent.), which, as we 

 have seen, does not immediately induce aggregation, 

 were then placed in a few drops of a strong solution 

 of one part of carbonate of ammonia to 109 of water, 

 and became finely aggregated. On the other hand, 

 leaves, after an immersion in water at 150"^ (Go'^'S 

 Cent.), on being placed in the same strong solution, 

 did not undergo aggregation, the cells becoming filled 

 with bro^Tiish, pulpy, or muddy matter. With leaves 

 subjected to temperatures between these two extremes 

 of 120^ and 150° Fahr. (48°-8 and 65°-5 Cent.), there 

 were gradations in the completeness of the process ; 

 the former temperature not preventing aggregation 

 from the subsequent action of carbonate of ammonia, 

 the latter quite stopping it. Thus, leaves immersed 

 in water, heated to 130° (54°'4 Cent.), and then in the 

 solution, formed perfectly defined spheres, but these 

 were decidedly smaller than in ordinary cases. AVith 

 other leaves heated to 140° (60° Cent.), the spheres 

 were extremely small, yet well defined, but many of 

 the cells contained, in addition, some brownish pulpy 

 matter. In two cases of leaves heated to 145° (62°-7 

 Cent.), a few tentacles could be found with some of 

 tlieir cells containing a few minute spheres; whilst 

 the other cells and other whole tentacles included 

 only the brownish, disintegrated or pulpy matter.- 



The fluid within the cells of the tentacles must be 

 in an oxygenated condition, in order that the force or 



