CO DROSEKA ROTUNDIFOLIA. [Chap. IV. 



cept sixteen or seventeen, were more or less inflected; but the leaf 

 was so much injured that it never re-expanded. The other leaf, 

 after having been left for half an hour in cold water, was put into 

 the strong solution, but no inflection ensued ; the glands, however, 

 were blackened, and in some cells there was a little aggregation, the 

 spheres of protoplasm being extremely small; in other cells, espe- 

 cially in the exterior tentacles, there was much greenish-brown 

 pulpy matter. 



Experiment 8. A leaf was plunged and waved about for a few 

 minutes in water at 140" (60" Cent.), and was then left for half an 

 hour in cold water, but there was no inflection. It was now placed 

 in the strong solution, and after 2 hrs. 3U m. the inner submarginal 

 tentacles were well inflecte<l, with their glands blackened, and some 

 imperfect aggregation in the cells of the pedicels. Three or four of 

 the glands were .spotted with the white porcelain-like structure, like 

 that produced by boiling water. I have seen this result in no other 

 instance after an immersion of only a few minutes in water at so 

 low a temperature as 140, and in only one leaf out of four, after a 

 similar immei-sion at a temperature of 145 Fahr. On the other 

 hand, with two leaves, one placed in water at 145 (62.7 Cent.), 

 and the other in water at 140 (60 Cent.), both being left therein 

 until the water cooled, the glands of both became white and porce- 

 Inin-like. So that the duration of the immersion is an important 

 element in the result. 



Experiment 9. A leaf was placed in water at 140 (60 Cent.), 

 which was raised to 150 (05.5 Cent.) ; there whs no inflection; on 

 the contrary, the outer tentacles were somewhat bowed backwards. 

 The glands became like porcelain, but some of them were a little 

 mottletl with purple. The bases of the glands were often more af- 

 fected than their summits. This leaf having been left in the strong 

 solution did not undergo any inflection or aggregation. 



Experiment 10. A leaf was plunged in water at 150 to 150} 

 (65.5 Cent.) ; it became somewhat flaccid, with the outer tentacles 

 slightly reflexed, and the inner ones a little bent inwards, but only 

 towards their tips; and this latter fact shows that the movement 

 was not one of true inflection, as the basal part alone normally bends. 

 The tentacles were as usual rendered of a very bright red, with the 

 glands almost white like porcelain, yet tinged with pink. The leaf 

 having been place<l in the strong solution, the cell-contents of the 

 tentacles became of a muddy brown, with no trace of aggregation. 



Experiment 11. A leaf was imnierse<l in water at 145 (62.7 

 Cent), which was raised to 1.56 (68.8 Cent.). The tentacles be- 

 came bright red and somewhat reflexed, with almost all the glands 

 like porcelain; those on the disc Ix-ing still pinkish, those near the 

 margin quite white. The leaf being placed as usual first in cold 

 water and then in the strong solution, the cells in the tentacles be- 

 came of a muddy greenish brown, with the protoplasm not aggre- 

 gated. Nevertheless, four of the glands escaped In-ing rendered like 

 porcelain, and the pedicels of these glands were spirally curled, like 

 a French horn, towards their upper ends; but this can by no means 

 be considered as a case of true inflection. The protoplasm within 



