1340 MESSRS. J. B. LAWES, 4. H. GILBERT, ARD M. T. MASTERS, 
Compared with the produce without manure, plot 8 gave in each separation-year 
a greater or less excess of Rumex Acetosa, and in three out of the four years of Achillea 
Millefolium; whilst in each year it gave considerably less of Plantago lanceolata, and, 
in a less degree, of Ranunculus repens and hulbosus. 
Compared with plot 7 (the result, therefore, being due to the exclusion of potass), 
Achillea Millefolium, Plantago lanceolata, Pimpinella Saxifraga, and the various species 
of Ranunculus were generally in excess, whilst Rumex Acetosa and Conopodium dcnu- 
datum were mostly in reduced amount. 
Lastly, compared with the results by superphosphate of lime alone, plot 8 gave, on 
the average, some excess of Achillea Millefolium, Conopodium denudatum, Rumex 
Acetosa, and in less degree of Ranunculus acris; but a considerable deficiency of 
Plantago lanceolata and of Ranunculus repens and hulbosus, and, to some extent, of 
Pimpinella Saxifraga and Luzula campestris. 
Upon the whole, the produce by the mixed mineral manure, including potass during 
the earlier years, but excluding it during the greater part of the total period, has pre¬ 
sented fairly even growth, with considerably mixed herbage; and, since the exclusion 
of the potass, both restricted luxuriance and maturation as compared with plot 7, and a 
gradual but very marked diminution in the proportion and amount of the Leguminosm, 
especially of the more superficially-feeding Lathyrus pratensis; Lotus, on the other 
hand, having increased. 
Among the Grasses a large number contributed to the herbage, and although 
Agrostis vulgaris, Festuca ovina, and Holcus lanatus are in the highest relative pro 
minence, each has considerably reduced in actual yield since the exclusion of the 
potass, as also have Dactylis glomerata and a number of others in less degree; whilst 
plants of such opposite characters as Arena elatior, Anthoxanthum odoratum, and even 
Lolium perenne, have increased in actual yield as compared with their produce on 
plot 7. 
Among the Miscellanese the most prominent, though each very variable in amount 
from year to year according to season, are Achillea Millefolium, Rumex Acetosa, and 
Conopodium denudatum, the first being in excess of the amount on plot 7, the other 
two considerably in defect. 
Lastly, comparing the results without manure, with superphosphate of lime alone, 
with the mixed mineral manure including potass, and with the same excluding potass, 
it is manifest that the effects, both as to quantity and to botanical and chemical com¬ 
position, are more dependent upon the supply of the potass than of any of the other 
constituents. 
One more striking point in regard to the botany of this plot is that it is here, where 
there is no nitrogenous manure to induce luxuriance, and where there is relative 
deficiency of potass, that, as on .plot 4-1, where there was equally no nitrogenous 
supply and less potass still, fairy-rings are of very frequent occurrence, whilst they 
are scarcely observed on any other plot; and this is so notwithstanding the fact 
