WATER-RELATION BETAVEEN PLANT AND SOIL. 



33 



affairs is in agreement with what might be expected from the seasonal 

 difference between the two periods. There appears to be nothing remark- 

 able about the behavior of this rate for either day; these graphs are 

 fairly representative of the conditions obtaining in a rather dry green- 

 house, on sunny days when some artificial heat is applied. 



ABSORBING POWER OF THE SOIL (/). 



For the February period the maximum (4.72) occurred with hour 16, 

 but nearly as high a rate was maintained till hour 18. The low night 

 rate was not here attained till hour 23, but it was maintained from hour 



10 II 12 13 14 15 16 17 18 19 20 21 22 23 24' I ' 2 ' 3 '4 ' 5*6 '7 '8 '9 

 FiQ. 1. — Graphs for Coleus. 



