igoo-i.] 



Effects of Water on Foliage Leaves. 



291 



The following tables show the results of the experiment; weight 

 given in grams, length of stem in centimeters : — 



Averag-e per cent, of ash to dry weight 16.37. 



II. a. 



Averag'e per cent, of ash to dry weight, 17.89. 



Gain per cent, in number of leaves 35-7 



" " leng-th of stem 29. 7 



dry weight 33.37 



" " ash 82.5 



The plants fed with the nutrient soXvXxon contained 1.^2 per cent, more 

 ash, in proportion to dry weight, than did those which were not fed. 



The important point brought out in this experiment is, that each 

 plant of Group II. (those fed with a nutrient solution in the form of a 

 spray), contained a higher per cent, of ash in proportion to dry weight 

 than did those of Group I. This is the more striking because it does 

 not depend upon approximations, as do the comparisons in weight with 

 Group I. Since it is impossible to calculate the amount of ash in a living 



