1356 
MESSRS. J. B. LAWES, J. H. GILBERT, ARD M. T. MASTERS, 
separation a much diminished, proportion; whilst P. trivialis, yielding largely in the 
earlier, contributed a mere fraction in the later years. Avena jlavescens has also gone 
down very much; whilst Festuca ovina, the prevailing grass without manure, with 
ammonia-salts alone, or with mineral manures alone, occurred here in very small propor¬ 
tion ; and several other grasses were only very meagrely represented. 
On 11-1, with the mineral manure and the excess of ammonia-salts, Dactylis 
glomerata has on the average contributed nearly 2000 lbs. per acre per annum, 
nearly the whole of which is in excess of the amount grown without manure. The plot 
has also yielded an average of more than 900 lbs. per acre per annum of Agrostis 
vulgaris in excess of plot 3, and in the fourth separation-year much more than this. 
Holcus lanatus, Alopecurus pratensis , Avena elatior , and Poa pratensis , have also 
each yielded, on the average, an excess of more than 500 lbs.; and, again, the Holcus, 
Alopecurus , and Avena elatior , much more in the fourth separation-year; whilst Poa 
pratensis yielded much less in that year. Poa trivialis also shows an average excess, 
due, however, entirely to a large excess in the first separation-year. Owing to the 
same cause (excess in the first year), Festuca pratensis , and Bromus mollis , also show 
some slight average excess. On the other hand, with this excessively high manuring, 
and considerably increased yield of a number of free-growing grasses, there was an 
actual deficiency of more than 300 lbs. of Festuca ovina, of about 100 lbs. of Avena 
pubescens, and of 93 lbs. of Lolium perenne, besides a deficiency of between 200 and 
300 lbs. of a number of comparatively meagre-growing species taken collectively. 
Compared with plot 9 with half the quantity of ammonia-salts, plot 11—1 has given 
an average of more than 1400 lbs. excess of Dactylis glomerata, but much less in the 
fourth year; an excess of several hundred pounds each, of Agrostis vulgaris, and 
Alopecurus pratensis, and of more than a hundred pounds each, of Holcus lanatus, and 
Avena elatior; but the excess of Agrostis , Holcus, and Alopecurus, was much greater 
in the last separation-year than on the average. There is an actual average deficiency, 
compared with plot 9, of nearly 700 lbs. of Festuca ovina, of nearly 400 lbs. of Poa 
pratensis, and of each the deficiency was very much greater in the last separation-year. 
There was also an average deficiency of between 100 and 200 lbs. of Avena pubescens 
and A. jlavescens , besides some deficiency in the quantities furnished by Bromus 
mollis, Lolium perenne, and a few other species taken collectively; but of the two 
species of Avena, the Bromus, and the Lolium, the deficiency was much the less in the 
later years. 
As the table shows, the occurrence of the Leguminosse may be said to be quite 
immaterial—indeed, all but accidental. 
Of the three most prominent Miscellanese, Rwmex Acetosa, Conopodium denudatum, 
and Achillea Millefolium, each has gone down in a very marked degree from the 
earlier to the later years; Rumex Acetosa being, in fact, the only one which was at all 
fairly represented in the fourth separation-year. 
Thus, with the mixed mineral manure, including potass, and an undoubtedly excessive 
