672 Ttie Smirces oj the Niirogen of our Leguminous Crops. 
In the experiments of 1 888, the gro\vth was not satisfactory 
with either blue or yellow lupins ; but, as will be seen farther 
on, it was so with yellow lupins in 1889. It would therefore 
be a waste of time and space to go into the details, either of 
the above-ground growth, the root-development, or the analyses 
of the lupins of 1888; and attention will be confined hereto 
the results obtained with peas in 1888, which, it will be seen, 
afford very important indications. 
As already said, the peas in each of the four pots genninated 
and gi'ew well. Those in the garden-soil were throughout the 
most luxuriant. Pots 2 and 3 were each seeded with 25 c.c. of 
the garden-soil-extract on August 13 — that is, just a week after 
the sowing of the seed. 
For some time the plants in pot 1 , in the sand without soil- 
extract, showed more growth, and better colour, than those in 
either pot 2 or pot 3 with the soil-extract seeding. It was. in 
fact, not until four or five weeks after the seeding with the soil- 
extract that the plants in pots 2 and 3 began to show a 
darker green colour than those in pot 1 without soil-extract. 
The indication was, however, then so striking that, on Septem- 
ber 25, it was decided to count the leaves, and to estimate, 
approximately, the relative area of leaf-surface of the plants in 
the different pots. For this purpose the leaves were classified 
into those which were bright green, those which were changing 
colour, and those which were withered. It will suffice to show 
the number, and the estimated relative area, of the total leaves 
in each case, on September 25, when the first counting and 
estimates were made, on October ] 7, on November 14, and on 
December 14, when the plants were cut. The following table 
summarises the results. 
Table III.— Peas, 1888. Total number of leaves, and Estimated relalire 
Leaf Surface, those of the Plants in Pot 1 (jrithout Soil-extract Seeding), <m 
September 25, being tahen as 100. 
Number of Leaves Estimated relative Leaf Surface 
Pot 1 
Pot 2 
Pots 
Pot 4 
Pot 1 
Pot 2 
Pot 8 
FDt4 
Beptembor 25 . . . 
- 
144 
140 
120 
164 
100 
67 
68 
128 
October 17 ... . 
188 
200 
184 
216 
143 
172 
1S8 
24] 
Kovember 14 . . . 
244 
300 
244 
280 
170 
249 
245 
328 
December 14 . . . 
382 
540 
390 
434 
267 
481 
434 
463 
Thus, on September 25, after the plants in pots 2 and 3, 
with the soil-extract seeding, had begun to show a darker green 
