504 BROOKLYN BOTANIC GARDEN MEMOIRS 
fails to appear, immediate though slow absorption being the rule. 
This intake gradually speeds up through the succeeding days, the 
absorption being roughly related to the original quantity of salt in 
the solution. This active absorption continues to the end of the 
experiment at which time the appearance of the seedlings and the 
WO 
&50 
700 
650 
ro 
Ss 
x.108 
iJ 
| 
S 
NORMAL CONCENTRATION 
Fic. 1. For explanation see text. 
diminishing absorption indicate approaching exhaustion. At this 
final stage of the experiment the plants have reduced the ion content 
of solutions of the salt to an approximately like minimum, which lies 
between 35 and 50 grm. norm. X 10~® Ca(NOs3)e. This concentration 
lies at about 25 grm. norm. X 10~° below the concentration reached 
