THE BATTLE OF LIFE. 105 
to Cereals, Crucifers (turnips), Chenopods (beet, man- 
gels), Solanums (potatoes), etc. 
Minerals and Nitrate.—The produce in those cases 
where this combination is used is generally large, ripens 
early, is of a dark green color, with abundant foliage 
and relatively little stem. The per-centage of grasses 
has been large, that of Leguminose very small, and that 
of miscellaneous plants on the whole greatly reduced, 
effects which, in general terms, are very similar to those 
observed on the mineral and ammonia plots. 
The mineral and nitrate appears to have encouraged 
the growth of Poa trivialis, Bromus mollis, and latterly 
of Alopecurus pratensis, while leguminous and miscel- 
laneous plants have been discouraged. The following 
grasses are discouraged by nitrate: Briza media, Cyno- 
surus cristatus, Poa pratensis. Leguminose in general 
and Umbelliferee and some Composites are also discour- 
aged. 
Cerastium triviale, Plantago lanceolata, Galium verum, 
Centaurea nigra, and Ranunculus, are slightly favored 
by the nitrate. 
The combination of minerals and ammonia favors the 
growth of Poa pratensis, Agrostis vulgaris, Festuca 
ovina, etc., more than does the admixture of mineral 
and nitrate. On the other hand, the following species, 
among others, are more benefited by mineral and nitrate 
than by mineral and ammonia: Poa trivialis, Dactylis 
glomerata, Bromus mollis, and Lolium perenne, etc. 
In some seasons, especially in years of drouth, (1870), 
Bromus mollis was extremely prevalent, its deep roots 
giving it an advantage over others. 
Effects of change of Manure.—The object sought at 
Rothamsted in changing the conditions of manuring has 
been to ascertain definitely to what particular ingredient 
