Mixed Herbage of Grass-Land. 
145 
employed with both mineral manure and ammonia-salts, that is 
to say with a combination itself yielding a pretty lull increase of 
produce, no further increase has been obtained by its means. 
Nor has the use, annually, of 2000 lbs. of finely-cut wheat-straw", 
in addition to the mixture of mineral manure and ammonia-salts, 
had as yet any beneficial effect upon the amount of gross produce 
per acre, notwithstanding the large amount of mineral matter 
peculiarly adapted for the growth of Graminaceous plants, which, 
in addition to its decomposing carbonaceous substance, it would 
in the course of time supply. 
Sawdust has, for similar reasons, also been tried on some of the 
crops grown on land under tillage, and with equal failure of 
beneficial result. 
So far as observation goes, the effects of sawdust have been as 
immateiial on the character of the mixed herbage as on its 
amount ; but as in the past season, 1862, in two out of the three 
cases where sawdust was employed potass was excluded from the 
mixed mineral manure used with it, the results are not, in the 
season in question, strictly comparable with those of the plots 
with which they had previously been compared, but which now 
differ not only in not having sawdust, but in having potass. The 
only strictly comparable experiments in 1862 are that of Plot 4 
with ammonia-salts alone, and that of Plot 5 with the same 
amount of ammonia-salts, and sawdust in addition ; and, so far as 
the figures go, it would appear that the sawdust somewhat reduced 
the proportion of the grasses, and increased that of the Miscel- 
laneous or weedy herbage. 
We now turn to a consideration of the next branch of the 
subject. 
II. — Tlie description, and proportion per cent., of the predominating 
species, in relation to the manures employed, and to the amounts of 
crop yielded. 
Table III. (pp. 146-147) illustrates this branch of the subject. 
As in Table 11., the plots are arranged in order according to the 
amount of produce, the one yielding the most being at the head 
of the list, and so on. The particulars given relating to the 
predominating plants are — 
1. The names, and proportion per cent, of the 5 predomi- 
nating Graminaceous plants, or genera. 
2. The names, and proportion per cent., of the 2 predomi- 
nating Leguminous plants, or genera. 
3. The same particulars for the 3 predominating Miscella- 
neous or weedy plants. 
Although it is believed that the figures in the various Tables 
VOL. XXIV. L may 
