1304 
MESSRS. J. B. LAWES, J. H. GILBERT, AND M. T. MASTERS, 
of lime alone ; mixed mineral manure (without potass) ; ammonia-salts, in various 
amounts, with, mixed mineral manure (including potass); nitrate of soda, in different 
quantities, with mixed mineral manure (including potass); ammonia-salts and super¬ 
phosphate of lime ; ammonia-salts and mixed mineral manure (with and without 
potass) ; ammonia-salts alone (13 years), succeeded by mixed mineral manure ; equal 
nitrogen and equal potass, in nitrate of soda and sulphate of potass, and in nitrate of 
potass, in each case with superphosphate of lime; mixture supplying the ash consti¬ 
tuents, and the nitrogen, of one ton of hay; and, lastly, farmyard manure alone, and 
with ammonia-salts in addition. 
The Tables .—The plan adopted is—referring to Tables X. and XI. in the Appendix 
for full particulars of the occurrence of each species, however small in amount, in 
each separation-year, on each plot—to embody with the text relating to each plot 
a table, showing, in the case of the grasses and of the Miscellanese, the full details 
for those species which have exceeded 1 per cent, of the total herbage in any one of 
the separation-years ; for those species which have occurred in less amount than 1 per 
cent, (bracketed together) the collective result only; and, lastly, a simple enumeration 
of all those which, though they occurred on the unmanured plot 3, were not found 
at all in any of the samples from the manured plot to which the table refers. This 
plan reduces the record in the tables with the text, and facilitates their study. In 
the case of the Leguminosae, the species of which are few, but of which the occurrence 
or absence is always important, the results are given in full detail. For each plot the 
particulars given are—1, the percentage of each species, or group of species, in the 
total mixed herbage; 2, the produce per acre, in lbs., of each species or group of 
species; 3, the increase or the decrease in the actual amounts of each species, or 
group of species, on the manured plot under consideration, compared with the amounts 
on the unmanured plot 3, as given in Table LXIII., p. 1294. 
With reference to this arrangement of the results in the tables, followed also in the 
discussion of them, it should be clearly recognised that, comparing plot with plot, the 
percentages of the different species, and the actual amounts of them per acre, may 
represent very different relations. Thus, supposing any particular species contributed 
5 per cent, to the total mixed herbage of a plot yielding say only 2,000 lbs. of total 
produce per acre, this would represent the growth of only 100 lbs. per acre of that 
species on that plot. Supposing, however, the same species contributed only the same 
percentage (5) to the herbage of a plot yielding say 6,000 lbs. of total produce per 
acre, this would represent the growth of 300 lbs. instead of only 100 lbs. of that 
species on the same area. Or, to put the converse case, supposing a species contri¬ 
buted 300 lbs. to a total produce of 2,000 lbs., this would represent 15 per cent, of 
that species ; but supposing the same species contributed the same amount, 300 lbs. 
per acre, to a total produce of 6,000 lbs., the identical amount of actual yield would 
only represent on that plot 5, instead of 15 per cent., of the total produce. Again, 
the increase or the decrease in the actual yield of the different species compared with 
