Chap. IV. THE EFFECTS OF HEAT. 71 



all the tentacles, except 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 proto- 

 plasm being extremely small; in other cells, especially in the 

 exterior tentacles, there was much greenish-brown pulpy 

 matter. 



Experiraent 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. 30 m. the 

 inner submarginal tentacles were well inflected, 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 boihng 

 water. I have seen this result in no other instance after an 

 immersion of only a few minutes in water at so low a tempe- 

 rature as 140°, and in only one leaf out of four, after a similar 

 immersion 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 

 porcelain-hke. 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° (65° '5 Cent.); there was no inflection ; 

 on the contrary, the outer tentacles were somewhat bowed back- 

 wards. The glands became like porcelain, but some of them 

 were a little mottled with purple. The bases of the glands were 

 often more affected 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 ten- 

 tacles slightly reflexed, and the inner ones a little bent inwards, 

 but only towards thek 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 placed in "the 

 strong solution, the cell-contents of the tentacles became of a 

 muddy brown, with no trace of aggregation. 



