1372 
MESSES. J. B. LA WES, J. H. GILBERT, AND M. T. MASTERS, 
odoratum and Avena pubescens . Avena Jlavescens, on tlie other hand, gave the highest 
average increase, and considerably higher than any other species on plot 16. Those 
next in order, and yielding considerably increased amounts, are Alopecurus pratensis, 
Agrostis vulgaris, Holcus lanatus, and Poa trivialis ; whilst the meagrely-growing and 
poor grass Festuca ovina, the luxuriant Dactylis glomerata, as well as Lolium perenne, 
and Bromus mollis , yield increase in a much less degree. 
Among the Leguminosas, Lathyrus alone gives considerably, but Trifolium repens 
slightly, more on plot 16 than without manure; but Trifolium pratense , and Lotus 
corniculatus, give notably less with the manure than without any. 
The increase of miscellaneous produce over the yield without manure is chiefly in 
Rumex Acetosa and Conopodium denudatum, in a less degree in Achillea Millefolium 
and Ranunculus acris ; whilst there is, with the manure, considerably less of Plantago 
lanceolata, and somewhat less of Ranunculus repens, R. bulbosus, and Centaurea nigra. 
There is also, under the influence of the manure, an average deficiency of other mis¬ 
cellaneous species taken collectively. 
The comparison which presents the greatest interest is, however, that between the 
actual yield of the different species and groups on plot 16 with the smaller, and on plot 
14 with the larger amount of nitrate. With the smaller amount, there is a very con¬ 
siderable deficiency in the actual yield per acre of the grasses collectively. The greatest 
deficiency, and it is here very large, is in Poa trivialis and Bromus mollis. There is 
also a considerable deficiency of Dactylis glomerata , and of Lolium perenne. There is, 
on the other hand, with the smaller quantity of nitrate, a marked excess in the actual 
yield of Agrostis vulgaris, Festuca ovina, and Avena Jlavescens , and a less average 
excess of Anthoxanthum odoratum, Avena pubescens, Alopecurus pratensis, and Holcus 
lanatus, the last two giving a relative deficiency in the last separation-year. 
Of Leguminous species there is, in proportion to the small total amount, a much 
greater yield with the smaller amount of nitrate. This increase is contributed by 
each of the four species enumerated, but in by far the greatest actual quantity by 
Lathyrus pratensis; whilst practically the whole of the much less actual yield of 
Trifolium pratense, Trifolium repens, and Lotus corniculatus, is in excess of the amount 
of them on plot 14. 
Am ong the Miscellanese, again, the average actual increase over the quantity on plot 
14 is contributed in a greater or less degree by each of the seven specially enumerated 
species ; Conopodium denudatum yielding the largest amount of it, Achillea Mille¬ 
folium and the various species of Ranuncidus less, and Plantago lanceolata, Centaurea 
nigra, and Rumex Acetosa, less still. Of the large number collectively which do not 
come into the special list, the aggregate quantity yielded is, on the other hand, smaller 
on plot 16 than on plot 14. 
So much for the detailed results obtained in the four years of complete separation. 
It should, however, be observed that the partial separations of subsequent years show 
a tendency to an increase in the proportion of total Graminese, to a decline in that of 
