1390 MESSRS. J. B. LAWES, J. H. GILBERT, AND M. T. MASTERS, 
It will be observed that, as was the case on plot 5, Fcstuca ovina remained by far 
the most prominent grass, and that its proportion increased in the last two separation- 
years, that is after the cessation of the application of the ammonia-salts, and the 
substitution of mineral manure ; but the increase was not by any means so marked as 
it was on plot 5, with the continued supply of ammonia-salts. Again, as on plot 5, 
Agrostis vulgaris was very prominent; and, although it showed an increase in the 
third separation-year, it had decreased very much in the fourth, Holcus lanatus 
having gradually increased, and much exceeded it. in that year; whilst on plot 5 
Holcus declined very much in the later years. The only other grasses which seemed 
to become distinctly more prominent after the change were Anthoxanthum odoratum 
and Dactylis glomerata; whilst Avena elatior and A. flavescens, Poa pratensis and 
P . trivialis , and Polium perenne , yielded fluctuating and small quantities ; and Avena 
pubescens , which had yielded largely in the first separation-year, gave very little in the 
second, and but little more in the third and fourth. Thus, the most prominent grasses 
were of low agricultural repute, nor were they characteristically free-growers; they 
were, on the other hand, such as have generally gained prominence under conditions of 
defective luxuriance and maturation combined. 
Among Leguminosse, Lathyrus pratensis very soon showed considerable increase 
after the application of the mineral manure; but, neither in the complete separation- 
years, nor in the intermediate and subsequent partial separations, has it acquired 
anything like the same degree of prominence as on plot 7, with the continuous supply 
of the same mineral manure, including potass, from the commencement. 
Among the Miscellanese there were five species which yielded more than 1 per cent, 
to the total produce in one or other of the separation-years ; whilst there were seven 
in this category on both plots 5 and 7. Of these, as usual, Rumex Acetosa was by far 
the most prominent; but it contributed very much less in the later years, though still 
more than on plot 5. Next in order is Achillea Millefolium , which has increased since 
the change of manure; whilst Conopodium denudatum has diminished, but again not 
so much as on plot 5. Luzula campestris has, on the other hand, become more 
prominent. Lastly, Galium verum, and Scabiosa arvensis, which by their increase in 
the later years came into the list of prominence on plot 5, with the ammonia-salts alone 
continuously, did not do so on plot 6. Although on both plots the proportion of total 
Miscellanese has gone down considerably in the later years, it has done so in a less 
degree on plot 6 than on plot 5. 
Comparing the actual yield per acre of the different groups and species with the 
produce without manure, the fluctuations were, as the result of the fluctuations in the 
seasons themselves, so great in the first two separation-years, that it is difficult to 
determine how much of the subsequent change is to be set down to change in the 
manure. 
The best indications of the effects of the change will be found in the comparison of 
the yield on plot 6 with that on plot 5. Beferring to the first two separation-years, 
