APPARATUS OF VEGETABLE PHYSIOLOGY. 257 



what we are to learn from the tracings which we have 

 obtained from it. From an inspection of them we find 

 that growth took place between six o'clock in the evening 



FIG. 4. 



and ten o'clock tha following morning, after which a period 

 of inactivity followed, until, towards four o'clock in the 



FIG. 5. 



afternoon, the process of growth recommenced; and we 

 find further that the period of growth is divided into two 

 well-marked epochs, the one extending from 7 P.M. until 



8 



