RECORD OF THE EXPERIMENTS. 27 
5 
nesium and calcium in the ratio F It must also be noted that 
although the equivalent solutions (Nos. 2 to 12) were 10 times as 
concentrated in this series as in experiment 3 the absorption from each 
solution was only about twice as great. 
Es 
50,000 
(4g ( WV 03) 
Fic. 15.—Seedlings of culture 1, experiment 3. 
EXPERIMENT 5. 
In experiment 5 a series of solutions of equivalent concentration, 
but grading from 100 Mg to 78 Mg+22 Ca, was used. The concen- 
tration was chosen because it was less than the concentration 
M 
20,000 
which quite inhibited the growth of laterals, but was well above 
the equilibrium concentration. The ratios of magnesium to calcium 
are grouped closely about the significant ratio * at which calcium 
231 
