Mixed Herbage of Grass- Land. 
151 
mixed mineral manure contained potass, as well as soda and 
magnesia (plot 8), the Lathyrus somewhat predominated ; and 
where the potass was excluded (plot 9) it was in a smaller pro- 
portion. Lotus, again, was more abundant on plot 8, where 
the potass was employed. As already alluded to, however, 
the total amount of Leguminous herbage was very much the less 
on plot 9," where the potass was excluded; and as at present it 
has only been for one season excluded, it is not improbable that 
the proportion of such herbage will in future be gieatly reduced. 
It is worthv of remark, too, that on plot 8, where the application 
of potass is continued, the proportion of Leguminous herbage 
was almost exactly the same in the produce of the seventh year 
of the experiments, 1862, as it had been found to be in that of 
the third season, 1858. 
Superphosphate of lime alone, which tended to decrease the 
proportion of Leguminous plants, seemed to be generally favour- 
able to the development of the Miscellaneous ones, both the 
variety and amount of such herbage being considerable. The 
proportion of Plantago lanceolata was nearly as great as on the 
unmanured plot, and that of Ranunculus (acris and bulbosus), 
Rumex, Achilla^a, and Carum Carui, was also comparatively 
large. On the other hand, the mixed mineral manures, which so 
much increased the proportion of the Leguminous plants, con- 
siderably diminished that of the Miscellaneous ones. The variety 
of such herbage was, however, considerable ; the reduction in 
amount being due to the diminished luxuriance of several 
species, and especially the Plantago, which was in very small 
amount. 
Effects of Ammojiia-Salts alone. 
Compared with the unmanured produce, ammonia-salts alone, 
or with sawdust only in addition, considerably increased the 
proportion of total Graminaceous herbage, and also the amount 
referable to the species of the five predominating genera, the 
latter reaching from G5 to (58 per cent, of the total produce. To 
a great extent, however, the same grasses prevailed as in the 
small crops without manure, or with mineral manures alone. 
The most prominent effect of this relatively excessive nitro- 
genous condition, was the encouragement of tlae Festuca durius- 
cula and Avena pubescens, two good elements predominating in 
the produce without manure ; to a greater extent still that of 
the objectionable creeping-rooted Agrostis ; and in some degree 
also that of the inferior Holcus lanatus. Compared with the 
effects on the distribution of the Graminaceous herbage. of mineral 
manure alone, the most marked result of the ammonia-salts alone 
was the great increase of the Agrostis and the Holcus, at the 
