EXPERIMENTS OX THE MIXED HERBAGE OF PERMAXEXT MEADOW. 
363 
away in the harvest, or which are contained in the plants which w r e are desirous to 
cultivate.” (Address—On the Principles of Artificial Manuring,” p. 26.) 
Again, in ridicule of the different plan followed in our experiments, he says : “ Shall 
we do as Mr. Law t es did ... A” and in answer he adds : “ Truly, in such cases, there is 
no other guide but logic, that is, sound common sense, which tells us, to give to the 
land what we have removed from it, neither more nor less. Of course, this is on the 
assumption that the land is to retain its original fertility only, not to be rendered 
more fertile than before.” (“ Principles of Agricultural Chemistry,” p. 63.) 
And again : “ Our first object will naturally be, to restore to the soil the mineral 
constituents in the same quantity and in the same proportions as those in which they 
have been removed in the crops ; and none must he omitted .” (Ih., pp. 83-84.) 
Another of the objects of the experiment was to acquire data as to the proportion in 
which the several constituents artificially supplied would be recovered in the increase 
of crop—a question the fuller consideration of which must be postponed to the third 
or Chemical Section of our report. 
The manures actually applied, and the constituents they contained, were as follows :— 
{ 38 lbs. potass. 
7 lbs. soda. 
367 lbs. chlorine. 
f 5 - 6 lbs. magnesia. 
\ 11T lbs. sulphuric acid. 
f ll'O lbs. lime. 
(_ 8'2 lbs. phosphoric acid. 
16'9 lbs. sulphuric acid. 
j P lbs. soda. 
[ 23 - 0 lbs. soluble silica. 
f ? lbs. lime. 
\ 8'0 lbs. soluble silica, 
f 34 0 lbs. nitrogen. 
< 44'4 lbs. sulphuric acid. 
I 46‘2 lbs. chlorine. 
76 lbs. commercial chloride potassium . 
35 lbs. sulphate magnesia. 
f26 lbs. bone-asb. 
(_ 26 lbs. sulphuric acid (sp. gr. 17) . . 
50 lbs. silicate soda. 
50 lbs. silicate of lime. 
164 lbs. “ ammonia-salts ”. 
If the quantity of constituents supplied, as shown in the right-hand column of the 
above tabular statement, be compared with the figures given on page 298 for the con¬ 
tents of lijr ton of hay, it will be seen that fully sufficient of all the constituents have 
been supplied for an increase of 1 ton of hay, wdfilst of soda, sulphuric acid, and chlorine, 
much more than sufficient has been applied. 
The experiment had been conducted 11 years, from 1865 to 1875 inclusive; and the 
following table gives the average produce per acre per annum over the first five-and-a- 
half, the second five-and-a-half, and the total period of 11 years; that is, the produce 
of the first five years, together with half that of the sixth, is divided by 5'5 ; and, 
again, the produce of the last live years and half of the sixth is, in like manner, 
divided by 5‘5. For comparison, the average produce obtained on the unmanured 
plot 3 is also given for the same periods. 
3 a 2 
