58 DEOSEKA 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. (4S'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 (65 0> 5 

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

 did not undergo aggregation, the cells becoming filled 

 with brownish, 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. With 

 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 0> 7 

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

 their cells containing a few minute spheres ; whilst 

 the other cells and other whole tentacles included 

 only the brownish, disintegrated or pulpy matter. 



Tbe fluid within the cells of the tentacles must be 

 in an oxygenated condition, in order that the force of 



