140 
The Ohio Naturalist. 
[Vol. X, No. 6, 
TABLE I. 
Transpiration Data for Solutions Inoculated Nov. 14, 1909, With 
Pure Cultures of Bog Bacteria. 
Transpiration in Grams 
Comparative 
transpiration 
Percentage 
decrease 
Series IV 
Bacteria 
5th day 
(Dec. 
16th) 
10th 
day 
15th 
day 
Total 
Check 
9 . 33 
42 . 92 
66 . 85 
119.10 
100. 
0. 
B. 20 
8.85 
41 .30 
44 . (Hi 
94.21 
79.10 
20 . 90 
B. 22 
8.30 
38.15 
42.90 
89.35 
75 . 02 
24.98 
B. 7 
8 . 55 
31 .80 
42 . 80 
83 . 1 5 
69.81 
30.19 
C. 3 
7.15 
30 . 90 
43.95 
82.00 
68 . 85 
31 .15 
C. 4 
7.60 
29 . 70 
44.40 
81 .70 
68 . 59 
31.41 
Dupli- 
cates 
Check 
8.80 
44.50 
66 . 83 
120.13 
100. 
0. 
B. 20 
8.40 
34 . 25 
45 . 98 
88 . 63 
73 . 77 
26.23 
B. 22 
7 . 05 
35 . 40 
46.10 
88 . 55 
73.71 
26 . 29 
B. 7 
8.15 
34 . 45 
42.21 
84.81 
70.59 
29.41 
C. 3 
8.10 
30 . 90 
44.25 
83 . 25 
69 . 30 
30 . 70 
C. 4 
8.40 
31.15 
41.65 
81.20 
67 . 59 
32.41 
Atmometer 
102 grs. 
1 36 grs. 
1 25 grs. 
Using the transpiration of the controls as a basis and repre- 
senting it as unity the different bacterial cultures have values 
in the order as indicated in the last two columns of the table. 
These figures show conclusively that in all cases the bacteria are 
responsible for the proportionally diminished transpiration and 
growth. The transpiration values fluctuate to a considerable 
extent; in some cases the differences from the controls are not so 
very great, but in all cultures the values lie below that of the 
control. 
The evidence derived from the duplicate series is omitted, 
showing, as it does, results as closely parallel as in Table I. 
To what extent Table II suggests the possibility that bacterio- 
logical diagnosis when correlated with physiological criteria 
may determine the crop-producing power of different soils need 
not be discussed at length. The figures speak for themselves. 
Several facts, however, seem to be clearly brought out in the 
above data. The transpiration figures of the first five days in 
B. 25 and B. 1 cc. indicate that the growth of the plants was 
considerably stimulated by the presence of the toxic bodies in 
the solution. Those of the last five days prove that the solution 
was decidedly injurious. B. 13 is worthy of note since the plants 
