SECOND EEPORT ON VARIOUS MANURES AT CHISWIOK. 149 
in the boxes treated with ammonia salts and with nitrate of soda 
respectively. 
On the Comparative I^ects of the Six Different Conditions of 
Manuring on the Twelve Species of Flants. 
If now, instead of tracing the effect of the several manures 
upon each description of plant separately, we compare the general 
effect of each manure on all the twelve plants, i.e. consider the 
comparative effect of the six different conditions of manuring, we 
find the following general results brought out. 
1. Unmanured. 
In the unmanured box the comparative vigour in all twelve 
plants was, generally speaking, at its minimum— though, after the 
cutting, the plants sometimes manifested the highest degree, as 
in Bromus and Trifoliwm pratense) in Plantago, on the other 
hand, the plants were at first high and afterwards degenerated. 
In general terms, this result is the same as that obtained last year. 
2. Mineral Manures. 
The plants under the influence of mineral manures were also, 
for the most part, of low growth, as in all the grasses and clovers — 
with this exception, that in Lotus as well as in Carum ultimately 
the plants manifested the maximum degree of development. So 
far as the grasses, plantains, milfoil and Carum are concerned, 
this tallied fairly with the results of the former year; but in the 
case of the clovers the case was reversed. 
8. Ammonia salts. 
The ammonia salts acted differently on the different grasses, 
having been, as in the preceding year, more favourable to the 
Bactylis than to the others, in which but little benefit was ob- 
servable till the spring of 1871, when the experiments were 
brought to a conclusion. These salts also were comparatively of 
little benefit to the Leguminosce, or indeed to the other plants. 
The general results were much the same as in 1869, but with less 
fluctuation in the case of Anthoxanthum. In Plantago the 
average vigour of growth was lower than in the preceding season. 
VOL. III. R 
