104 PLANT LIFE ON THE FARM, 
ovina, Agrostis vulgaris, Avena elatior, Holcus lanatus 
and Poa pratensis, are noted to have been predominant, 
Poa trivialis, on the contrary, being practically banished. 
The two first-named plants owe their predominance not 
exclusively to the manure, for they thrive luxuriantly 
under many other conditions, A similar remark applies 
to Rumez Acetosa. On those plots where the quantity 
of ammonia salts was doubled, Dactylis glomerata for 
some years was in enormous preponderance, Agrostis vul- 
garis, Holcus lanatus, Alopecurus pratensis and Avena 
elatior have been also in large quantities. Briza media. 
Cynosurus cristatus, Lolium perenne, Bromus mollis, all 
poor grasses, except Lolium, have been discouraged by 
the ammonia. Poa trivialis also has greatly diminished 
in proportion to the quantity of P. pratensis. 
Among the miscellaneous plants, Ranunculaces, like 
the Leguminosx, have been practically banished. Um- 
belliferse have been almost expelled, Composite largely 
diminished, Labiates greatly reduced ; Plantago lanceo- 
lata is unrepresented, and even Rumex Avetosa consider- 
ably diminished. As these or corresponding effects are 
generally observed where ammonia forms part of the ma- 
nure employed, and as they are enhanced when the 
quantity is increased (though not in direct proportion), 
it would seem (hat ammonia must be actually prejudicial 
to some plants. It is probable, however, that the dimin- 
ished proportion of these plants is more often due to the 
increased luxuriance of the stronger-growing grasses than 
to the directly prejudicial effects of the manures on the 
other plants. 
It is generally observed, that on the ammonia plots 
the plants show a great tendency to form leaves, and 
when mineral manures are added, the period of ripening 
is hastened, and its degree enhanced.. A combination of 
mineral and ammonia salts, where the latter are not in 
excessive proportion, is beneficial to almost all crops, as 
