Chap. IV.] THE EFFECTS OF HEAT. 63 



It may be worth adding that immersion in cold water 

 does not cause any inflection : I suddenly placed four leaves, 

 taken from plants which had been kept for several days at a 

 high temperature, generally about 75 Fahr. (28.8 Cent.), 

 in water at 45" (7''.2 Cent.), but they were hardly at all 

 affected; not so much as some other leaves from the same 

 plants, which were at the same time immersed in water at 

 75 ; for these became in a slight degree inflected. 



expected, far more sensitive to at a temperature of only 85' 

 an Increase of temperature than Fahr. At 95" the muscles be- 

 ts Drosera. Thus, as I bear from come rigid, and the animal dies 

 r>r. Burdon Sanderson, a frog in a stiffened condition, 

 begins to be distressed in water 



