1 7 ° 
Redfern. — On the Absorption of Ions 
Four plants from each group were removed from the culture solutions 
after a lapse of 36 hours, another four from each group after 60 hours, and 
the remaining four of each group after 84 hours. The mean percentage 
absorption of calcium and chloride in each case is set out in the two 
following tables along with the probable error of the mean, though, owing to 
the small number of plants used, the errors can claim no high degree of 
accuracy. 
Table I. 
Percentage absorption of calcium by roots of edible pea from various 
strengths of calcium chloride solutions. 
Concentration. 
N 
10 
N 
100 
N 
1000 
Percentage absorption after 
36 hours. 60 hours. 
i7-74± i*37 6 
19.61 ±2.33 
23-10 + 5.30 
12.77 ± 1-84 
8-244 + 1. 471 
84 hours. 
14-61 +I-68 
Table II. 
Percentage absorption of chloride by roots of edible pea from 
solutions of calcium chloride of various strengths. 
Concentration. 
N 
10 
N_ 
100 
N 
1000 
Percentage absorption after 
36 hours. 60 hours. 84 hours. 
3-57 8 ± o -5 o 6 4-021+0-073 3.856 + 0.351 
12-47 ± r -66 10.66 +0-856 12.47 ±1-16 
15-09 ±3-736 
In the case of solutions of concentration, the results became very 
1000 J 
irregular after the first day, and the analyses were not continued. With 
N 
a concentration of the results of the calcium analyses were irregular 
after the second day, so that no average for the absorption of calcium could 
be calculated for the third day. On the fourth day there was no uniformity 
in the results obtained from any of the analyses, so no averages were 
calculated. 
The mean electrical conductivity of the solutions for each day is given 
in Table III. 
