72 
EIGHTH REPORT. 
The rows are numbered from the east. The first eleven were inocu¬ 
lated with soil from a plot bearing cowpeas last year with roots heavily 
infected. 
In the table enclosed the nitrate of soda plot and the other four are 
given in order, each row by itself with the number of plants in the 
row and the average number of nodules per plant. The average is then 
given for the inoculated and uninoculated halves of the several plots. 
NODULES ON THE ROOT OF COWPEAS. 
NITRATE OS' SODA. 
Row. 
No. of plants. 
Av. No. nodules. 
1 . . . . 
_ 69 . 
30 78 
2 . ... 
_ 70 . 
. 37 05 
3 .... 
_ 66 . 
. 35.98 
4 . .. . 
_ 50 . 
32 56 
5 .... 
_ 57 . 
36 01 
6 ... . 
_ 41 . 
32 62 
7 .... 
_ 48 . 
22 21 
8 ... . 
_ 54 . 
42 46 
9 . .. . 
22 12 
10 .... 
29 96 
11 .... 
22 14 
Average 
12 .... 
of 
inoculated . 
22 01 
13 .... 
24 50 
14 .... 
42 11 
15 .... 
42 12 
16 ... . 
25 24 
17 .... 
26 22 
18 .... 
46 22 
19 .... 
44 26 
20. 
40 40 
21 .... 
55 42 
22 .... 
80 78 
Average 
of 
uninoeula.ted 
PHOSPHORIC ACID. 
1 .... 
_ 56 . 
20 22 
2 .... 
29 16 
3 .... 
22 22 
4 . .. . 
22 91 
5 .... 
12 90 
6 . . . . 
17 44 
7 . . . . 
12 75 
8 . .. . 
21 06 
9 . .. . 
21 61 
10 .... 
22 61 
11 .... 
19 91 
Average 
of 
inoculated . 
12 .... 
_ 67 . 
25 55 
13 .... 
_ 61 . 
19 22 
14 .... 
_ 62 . 
20 90 
15 . ... 
_ 58 . 
21 60 
16 .... 
_ 48 . 
22 21 
17 .... 
_ 52 . 
17 44 
18 .... 
_ 53 . 
20 29 
19 .... 
22 22 
20 .... 
_ 29 . 
22 65 
21 . . . . 
.... 27 . 
27 07 
22 .... 
_ 27 . 
. 18.66 
Average of uninoculated . 21.93 
