15G 
Effects of different Manures on the 
to tlie conclusion tliat tliey were predominating. All these 
grasses occurred in larger amount than where the nitrate of soda 
M as used alone. But the most remarkable effect of the addition of 
the mixed mineral manure was the almost entire exclusion of the 
Alopecurus pratensis, which had flourished in such an extraor- 
dinary degree under the influence of the nitrate of soda alone, 
and the great development in its stead of the Avena flavescens, 
which under the latter condition had occurred in very insigni- 
ficant amount. With twice the amount of nitrate of soda and the 
same mixed mineral manure, the distribution of Graminaceous 
species was again very strikingly but very differently affected, 
Poa trivialis was now the predominating species ; and Dactyiis 
glomerata, Lolium perenne, and Bromus mollis Avere also in con- 
siderable quantity ; Holcus lanatus coming next in order. Here 
again Alopecurus pratensis — the characteristic plant with nitrate 
of soda alone — was almost excluded ; whilst Festuca duriuscula 
was reduced to a very insignificant amount, and Avena flavescens 
— so luxuriant with the smaller amount of nitrate and mineral 
manure — was here bv no means prevalent. With regard to the 
great prominence of Poa trivialis and Bromus mollis on the plot 
now under consideration, it is, however, worthy of remark that 
it adjoined Plot 17, manured with farmyard-manure and am- 
monia-salts, Avhere these two grasses were the characteristic 
plants. It would seem probable, therefore, that the result was, 
at any rate partly, due to seeding from the farmyard-manure 
plots, and hence so far accidental. 
Of Leguminous plants, there was a somewhat larger propor- 
tion than by nitrate of soda alone, or by ammonia-salts either 
alone or in combination with the mixed mineral manure, though 
much less, especially of Trifolium, where the larger than where 
the smaller amount of nitrate of soda (with the mineral manure) 
was used, and in both cases very much less than without manure. 
The Lathyrus was more frequent than the Lotus : the latter, 
indeed, was all but wanting. 
The amount and character of development of the Miscellaneous 
herbage differed very greatly on the two plots with nitrate of 
soda and mineral manure, both the proportion and the luxuriance 
being generally much greater with the smaller amount of nitrate. 
VV ith the smaller amount of nitrate, Rumcx acetosa. Ranunculus 
(acris and bulbosus), Carum Carui, and Achilla?a millefolium 
were all both frequent and luxuriant, and Plantago lanceolata 
was somewhat so. With the larger amount of nitrate, Rumcx 
acetosa was bv far the most frequent and abundant weed ; neither 
Acliillapa millefolium nor Plantago lanceolata was at all preva- 
lent ; whilst Carum Carui and Ranunculus (acris and bulbosus), 
though somewhat frequent, were not luxuriant ; and other weeds 
