RECORD OF THE EXPERIMENTS. 15 
E M : ons 
No. 1 (= 00 000 Mg(NO,),). Primary roots alive; laterals none. 
No. 2 = Mg(NO,),). Primary roots dead; solution discolored. 
ee oF se Ma (NO;),+- arc Ca(NO;),) to 12 (oe Mg(NO,)s+5 999 5 Ca(NO,), 
Nos. 3 (= ( r= ppg ca ») to = ous 3Jotz ). 
Root sgnteen ne dev arse laterals long and flexuous. 
he ae oa 
No. 13 (= 000° a(NQO,).). Roots as in Nos. 2 to 12. 
No. 14 (distilled water). Root system well developed; laterals rigid, divaricate, and 
thicker than in Nos. 3 to 13. 
Fic. 8.—Seedlings of culture 14, experiment C. 
The solutions of this series were made up with triple-distilled water 
(water from the laboratory still redistilled from alkaline and then 
M 
500 
Mg(NO.,), is extremely toxic, and (2) that the substitution of calcium 
from acid KMnO,). Significant points to be noted are (1) that 
ir: M ; 
for one-tenth of the magnesium in an 500 solution makes it as good a 
231 
