142 
Effects of dffcrent Manures on the 
almost the lowest proportion), about 7 per cent, of Leguminous 
lierbage, and nearly the highest proportion of Miscellaneous or 
weedy herbage. 
Again, whilst the smallest number, or only 21 species of 
plants, was discovered in the sample of the heaviest produce, the 
largest number, or 43 species, was found in that of the smallest 
produce. 
These extreme results prominently bring to view the fact, that 
with large produce there was an almost exclusively Graminaceous, 
and a comparatively simple herbage ; and that with small pro- 
duce the herbage was at once much less Graminaceous, and 
much more complex. There is, moreover, with some instructive 
exceptions to which attention will be directed, something like a 
gradual decrease in the proportion of Graminaceous, and increase 
in that of the Miscellaneous herbage, and especially in the number 
of species, as we proceed from the larger to the smaller crops. 
Taking the results given in the Table a little more in detail, it 
will be well to bear in mind the general character of the herbage 
on the unmanured land, as the standard by which to compare that 
on the variously manured plots. 
The unmanured produce, taking the mean result of the two plots, 
consisted, in round numbers, of about 74 per cent. Graminaceous, 
6 to 7 per cent. Leguminous, and about 19 per cent. Miscellaneous 
herbage ; and it comprised about 40 species of plants. 
In contrast with the above composition, that of the six or seven 
heaviest crops at the head of the list in the Table (II.) may be 
taken, in round numbers, at from about 90 to 95 per cent. Gra- 
minaceous, from 0 to 0"86 per cent. Leguminous, and from 5 to 
something over 10 per cent. Miscellaneous herbage ; the number 
of species varying from 21 to 30. J 
Comparing these heavier crops with one another, it is inter- 
esting to observe that Plot 13 h, manured with ammonia- 
salts and a mineral manure including silicates, gave a higher 
percentage of Graminaceous, and a lower percentage of Mis- 
cellaneous herbage, than Plot 13 a, with otherwise the same 
manure but excluding silicates. Again, Plot 10 with ammonia- 
salts and mineral manure including potass, gave rather more 
produce, and a rather higher proportion of Graminaceous 
herbage, than Plot 11, with the same amount of ammonia- 
salts, and otherwise the same mineral manure (and sawdust 
in addition), but excluding potass. Plot 10 also gave rather 
more produce than either Plot 12 a or Plot 12 h, wliich had 
the same amount of ammonia-salts and mineral manure, with 
2000 ll)s. of cut Avhcat-straw per acre per annum in addition, 
though these plots with the cut wheat-straw gave a slightly higher 
projKH'tion of Graminaceous herbage. 
Plot 15, with the same mineral manure as Plot 10, and with 
