AMERICAN JOURNAL OF BOTANY 
[Vol. 8, 
Table i. Effect of the soil on the weights^ of the garden beet, Beta vulgaris, vars. Early 
Model and Egyptian Early, the roots of which were inoculated with Bacterium tumefaciens. 
Growing in pots containing " garden soil and manure^ "B" brown silt loam, "C" manure 
and brown silt loam, "D" medium sand 
No. 
Pot A 
Pot B 
Pot C 
Pot D 
Fresh 
Dry 
Fresh 
Dry 
Fresh 
Dry 
Fresh 
Dry 
3175 
3-30 
81.40 
5-40 
38.30 
3.00 
36.80 
3.60 
2 
60.00 
5.60 
46.00 
4-50 
2.10 
1.50 
30.00 
3.80 
3 
113.60 
11.80 
37.10 
3-00 
46.10 
4-70 
38.60 
3-60 
4 
65.40 
5-50 
24.60 
1.80 
32.10 
3-30 
33.50 
4-50 
5 
38.60 
4.60 
51.00 
4.10 
10.00 
1.20 
23-70 
2.70 
6 
45-50 
4.80 
24.10 
2.30 
22.30 
2.10 
36.00 
4.20 
7 
45-00 
5-30 
26.00 
2.70 
36.50 
4.40 
37-70 
4.30 
8 
42.50 
4.60 
33-10 
3.00 
22.60 
2.40 
5-10 
.90 
9 
67 so 
1=; ^0 
19.10 
1 .40 
1.20 
8.70 
.00 
10 
51.10 
6.15 
60.00 
3-90 
13.20 
1.60 
53.70 
5.50 
II 
71.10 
7.10 
66.60 
7-50 
9.50 
1. 00 
13.70 
1.90 
12 
78.10 
9.00 
21.60 
1.20 
7.10 
.80 
9.00 
2.10 
13 
49.60 
4-50 
17.00 
1.50 
32.50 
2.80 
14.90 
2.30 
14 
25-50 
2.20 
9-50 
1.60 
51.00 
5.00 
24.00 
2.10 
T C 
13.20 
1.80 
34.00 
3.50 
74-00 
8.40 
20.00 
2.60 
corrections 
16 
33-90 
3-10 
19.00 
66.70 
7.80 
33-00 
.80 
17 
36.30 
3.60 
22.50 
1.70 
22.50 
2.20 
24.10 
5.50 
18 
22.40 
2.50 
27.50 
2.60 
55-80 
4.40 
3-70 
3-60 
19 
13.80 
1.30 
10.30 
corrections 
12.40 
1.80 
6.00 
20 
31.00 
3-15 
21 
27.80 
2.90 
22 
2.60 
51.20 
5-50 
23 
8.60 
16.00 
1.80 
24 
4-50 
13.40 
1.70 
25 
2,70 
10.00 
1. 00 
Totals. . . 
904.85 
92.05 
630.40 
63.00 
728.70 
75-65 
452.20 
53-50 
Averages 
46.57 
4-73 
33.17 
3-316 
29.14 
3.02 
23.80 
2.81 
The plants, three to four in each pot, were inoculated as described above 
with Bacterium tumefaciens on July 20, 1920. On October 9, 1920, the 
plants were removed from the soil, and the sizes and weights of the roots 
grown in the different soils were compared. 
Figure I shows the general development of the plants as they appeared 
in the pots and represents two average pots from each group of twelve, of 
the varieties Early Model and Egyptian Early. "A" represents the plants 
grown in the garden soil with an abundance of manure, ''B" the plants in 
the blown silt loam, "C" the plants in brown silt loam and manure, and 
''D" the plants grown in medium sand. 
The plants grown in pot "A" (garden soil plus manure) are much 
larger than those in pots "C" (brown silt loam and manure) and in "D" 
(sand), but the difference is not so marked between "A" (garden soil and 
manure) and "B" (brown silt loam). The leaves of the plants growing in 
pot "A" are somewhat larger and appear to be more numerous. While we 
^ Weights given in grams in all tables. 
