8o 



LECTURE V. 



that of the former that it appears as if the former only were in 

 operation. 



The following may be cited as examples of the results which he 

 obtained ; the figures in the third column denote the amount in c.c. of 

 diminution of the air in the tube (Fig. 15) effected by 100 grammes of the 

 plant. 



FIG. 15. 



FIG. 16. 



Figs. 15 and 16 illustrate Garreau's experiments: 



FIG. 15. ABC is a glass tube of 1000 2000 c.cm. capacity; its lower end is 

 immersed in a vessel D containing water ; at B there is a watch-glass contain- 



