PERMANENT WILTING IN PLANTS 



107 



* Calculations made by means of the Briggs and Shantz formula, from the 

 water holding power of the soil used. 



t The word box here denotes the glass box; ch., sh. denotes chamber in shelter; 

 ch., open denotes chamber in open. 



t The hours of the day are simply numbered in a single series, from 1 to 24; 

 thus, the thirteenth hour is the first hour after midday, etc. 



