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 



9O0 

 650 



750 



Squash Cafmi I8°C. 



900 



850 



750 

 700 

 650 



I. 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 lO""^ Ca(N03)2. This concentration 

 lies at about 25 grm. norm. X io~^ below the concentration reached 



