1334 
MESSRS, j. B. LAWES, J. H. GILBERT, AND M. T. MASTERS, 
The Miscellaneous plants which on the average have contributed rather more to the 
produce than without manure ar e—Rumex Acetosa, Achillea Millefolium, Ranunculus 
repens, and R. bulbosus, and, in a very insignificant degree,- Pimpinella Saxifraga ; 
whilst Conopodium denudatum, Luzula campeslris, and Centaurea nigra, actually 
yield less than without manure. 
The general result by superphosphate of lime shows, then, comparatively immaterial 
change from the condition of the unmanured herbage, whilst that which is observed, 
is mainly due to increased maturation, and not to increased luxuriance. The general 
aspect of the plot is that of comparatively puny and stemmy development of freer- 
growing species, or the predominance of those of small habit, according to the season. 
In the case of the grasses, the second growth is much more characterised by a large 
proportion of fine-leaf than is the first; the smaller grasses predominating. Among 
the Leguminosse, Lathyrus shows less of prominence in the second than in the first 
crops. Among the Miscellanese the chief weeds attain a greater degree of maturity. 
Thus, an examination of the botany of the superphosphate plot, and a comparison 
of it with that without manure, fully confirms the indications of the yield of hay, of 
fiitrogen, and of mineral matter, and shows conclusively that the striking effects, both 
in increased yield and in development of individual species, which were produced on 
plot 7, with the mixed mineral manure, including potass, were but little, if at all, 
attributable to the superphosphate of lime which that complex manure contained. 
6 . Mixed mineral manure, alone, with and without potass; Plot 8 . 
As the superphosphate of lime of the mixed mineral manure was obviously not the 
potent agent, at least when used alone, the results must be traceable to the potass, 
the soda, or the magnesia salt, separately or conjointly, which were employed with it. 
For the first six years of the experiments, plots 7 and 8 each received the same mixed 
mineral manure, including potass; but from that time (1862), and since, the same 
manure has been still annually applied to plot 7, and the same, excluding the potass, 
to plot 8 ; an increased amount of soda salt being used instead. From, the time of 
this change, not only the produce of hay, but the yield of nitrogen, and of mineral 
matter, diminished very greatly on plot 8, now without potass. Taking the results of 
the partial as well as of the complete separations, it appears that the percentage of 
total gramineous herbage has been almost uniformly greater in the smaller amount of 
produce yielded on plot 8 without, than in the larger amount on plot 7 with the potass. 
Without the potass the percentage of the Leguminosse diminished exceedingly ; 
whilst that of the miscellaneous species collectively rather increased. The yield per 
acre, however, of each of the three descriptions of herbage considerably diminished 
after the exclusion of the potass. As referred to more fully at pp. 316, et seq., 
of Part I., and as will be shown in detail in Part III., from the time of the cessa¬ 
tion of the application of the potass-salt, the amount of potass annually taken up 
by the crop declined in an extraordinary degree; and not only so, but the amount 
