266 
RODNEY H. TRUE 
. . . 
TS 
\ 

r 
rs/?—A/0 
^ ^ ^ 
OOTS 
N 
\ 
\ 
\ 
D/ST/l 
LED 
ROOTS 
\- 
/s 
O 3 6 9 /2 
Fig. I. Changes in the conductivity of distilled water and of Potomac water 
due to their action on lupine roots. 
lytes as the distilled water culture containing lo roots, and only about 
twice the quantity found in the distilled water containing 4 roots. 
The distilled water check containing no roots showed a slight 
though steady rise, due largely perhaps to the gradual solution of the 
2/ 
