14 ABSORPTION AND EXCRETION OF SALTS BY ROOTS. 
fered from the one immediately preceding, in that its concentration 
with regard to magnesium nitrate was less by ane and its concentra- 
tion with regard to calcium nitrate greater by ee No. 12; “of 
? 
N 
course, was ae calcium nitrate. No. 13, bearing the same relation- 
Fig. 7.—Seedlings of culture 13, experiment C. 
ship to No. 12 as No. 1 to No. 2, was = calcium nitrate: The two 
) 
sti solutions of the pure salts (Nos. 1 and 13) were used in order to 
determine the effect, when used alone, of the smallest concentration of 
magnesium or calcium nitrate contained in any of the mixed solutions. 
No. 14 was distilled water. The cultures were carried seven days in 
experiment A. At the end of this period the condition of the plants 
was as follows: 
231 
