OH THE MIXED HERBAGE OF PERMANENT MEADOW. 
i 395 
327 lbs. of nitrate of potass, containing the same amount of nitrogen as the 275 lbs. 
of nitrate of soda. To plot 19 was also applied 290 lbs. of sulphate of potass, con¬ 
taining the same amount of potass as in the 327 lbs. of nitrate of potass supplied to 
plot 20. To both plots superphosphate, in the same amount as used on other plots of 
the series, was also applied. 
Thus, so far as nitrogen, as nitrate, and superphosphate, are concerned, the two 
plots, 19 and 20, were manured precisely as plot 16 had been for 14 preceding years, 
and as it continued to be subsequently. Plot 16 received, however, about 5 lbs. per 
acre per annum more potass, and some sulphate of soda and sulphate of magnesia in 
addition. The only difference between the manuring of plots 19 and 20 was, that 
plot 19 received the soda of the nitrate, and the sulphuric acid of the sulphate of 
potass, in addition to the constituents supplied to plot 20. On the other hand, 
plot 20 received its nitric acid and its potass in combination. 
The folding Table (LXXX.) shows the percentage and the acreage particulars of each 
group and species for plots 16, 19, and 20, in the last two complete separation-years 
(1872 and 1877), the experiments of 19 and 20 only commencing in 1872. There is 
also given, the * difference between the produce on each, compared with that on plot 3 
without manure ; and plots 19 and 20 are each compared with plot 16, and -with one 
another. 
In each of the two separation-years each of the three plots 16, 19, and 20 shows 
considerably fewer species than the unmanured plot 3 ; the deficiency being almost 
exclusively in the Miscellanese. Plot 16, which has been the longer under treatment, 
shows a slightly greater average deficiency in number, and both 19 and 20 show a 
greater reduction in number in the second than in the first of the two separation-years. 
The actual number of species found in the samples in the two separation-years was, in 
those from plot 16, 36 and 41 ; in those from plot 19, 40 and 39, and in those from 
plot 20, 42 and 38. 
According to the determinations in the complete separation-years, both plots 19 and 
20 show a higher average percentage of Grammese than plot 16, but, according to the 
subsequent partial separations, plot 16 indicates the higher proportion in the first, but 
not in the second crops. Of Leguminosae, the older plot, 16, which received rather 
more of potass, and some other mineral constituents, gave a higher percentage in the 
earlier seasons (especially in the complete separation-years), but according to the sub¬ 
sequent partial separations a less proportion in the later seasons. In the period prior 
to that of our comparison, plot 16 gave a much higher percentage of Miscellanese than 
subsequently, but in the later years it has, on the average, given less than on either 
plot 19 or 20; and plot 19, with the nitrate of soda and sulphate of potass, has each 
year given a less proportion than plot 20 with the nitrate of potass. 
Referring to individual species, the table shows that on both plots 19 and 20 the two 
prevalent grasses of the locality under poor conditions, Festuca oviyia and Agrostis 
vulgaris , were by far the most prominent in the first of the two separation-years. In 
