RECORD OF THE EXPERIMENTS. 31 
It is obvious that these results show no progressive efficiency of 
absorption with increasing calcium which is comparable to the great 
differences in absorption shown by cultures 2 and 3 of experiments 
ow 8 — 
: 2,000,000 — MEINE a3 
17 
2,000,000 Ca (W0s)2 
Fic. 19,—Seedlings of culture 2, experiment 5. 
3 and 4. In experiments 3 and 4 what absorption there was from 
the magnesium solutions had to take place through the surface of 
an unbranched primary root of constantly diminishing vitality. In 
this experiment, on the contrary, the dilution of the magnesium 
231 
