RECORD OF THE EXPERIMENTS. 29 
nitrate which made the difference between roots with almost no 
laterals and roots with well-developed laterals was corre- 
M 
3,000,000? 
sponding to one part, by weight, of calcium in 50,000,000 parts of 
water. The plants of the three significant cultures of this series 
are shown in figures 17, 18, and 19. 
Fic. 17.—Seedlings of culture 14, experiment 5. 
TABLE V.—Statement of results, experiment 5. 
Number of culture ......... | i 2 3 4 5 
Cemiposition = .:.=:-222-2-2-- 100 Mg. 99 Mg+1Ca. | 98 Mg+2Ca. | 96 Mg+4Ca. | 94 Mg+6 Ca. 
Concentration: 
100 M 100 M 100 M 100 M 100 M 
Before growth.......... SS eee Se = = awe 
gro 2, 000, 000 2, 000, 000 2, 000, 000 2, 000, 000 2, 000, 000 
43M 54M 28 M 48 M | 40 M 
After growth........... SOS SEE = San samam }|llOUBO 
er growth 2, 000, 000 2, 000, 000 2, 000, 000 2,000,000 | 2,000,000 
231 
