168 



A TEXTBOOK OF BOTANY 



[Ch. IV, 8 



or a Jack-in-the-Pulpit will rise two or three degrees, and in 

 some tropical plants of the same family, two or three times 

 as much ; while in any living parts the release of some heat 



Fig. 116. — An Anoxyscope ; X \. The two tube-chambers are exactly- 

 alike except that from the one on the right all oxygen is removed by a 

 chemical absorbent (pyrogallate of potash), which is replaced by pure 

 water in the. one on the left. In the case here shown, the soaked oats placed 

 on wet moss in both chambers have grown well in one case but not in the 

 other. The instrument permits many analogous experiments. 



