322 Field Experiments on Swedish Turnips. 
In precipitated phosphate of lime we have a phosphatic fer- 
tiliser in a more minutely divided condition than in finely 
ground coprolites or Redonda phosphate. Like these minerals, 
precipitated phosphate of lime, although derived from bone, 
practically speaking contains no organic matter or nitrogen in 
any form. 
In bone-meal, insoluble phosphate of lime is associated with 
nitrogenous organic matter ; and in dissolved bones, soluble 
phosphate of lime, with more or less insoluble phosphate 
of lime and gypsum, is associated with nitrogenous organic 
matter. The guano, bone-meal, dissolved bones, and precipi- 
tated phosphate of lime, used in 1881, were portions left over 
from last year's experiments ; and having been kept in bags 
under cover, may be assumed to be of the same quality and 
composition as manures of the same name which were used 
in the swede experiments on Warren-field in the preceding 
year. 
The ground coprolites, dissolved coprolites, and Redonda 
phosphate were taken from fresh supplies. 
For ground coprolites we had to pay 16s. more per ton than 
in the preceding year ; and for dissolved coprolites 10s. less, the 
price of both being 4Z. per ton. The price of Redonda phos- 
phate in 1880 was 21. 2s. per ton, whereas in 1881 we had to 
give 3Z. 10s. for it. The last supply, however, as will be seen 
from the appended analysis, was richer in phosphoric acid than 
the Redonda phosphate which we bought in the preceding 
year. 
With the exception of the mixture of Peruvian guano and 
superphosphate, which was applied to plot 8 at an expense of 
21. 3s. 3d. per acre, the cost of the remaining fertilisers varied 
from 17s. 6d. to 22s. Qd. per acre. In most instances the cost 
of manures was 11. per acre. 
The diagram on the opposite page shows the arrangement of 
the 16 quarter-acre plots. 
The artificial manures were applied to the land on the 10th 
and 11th of June, and the seed (Gibbs's Selected Purple-top 
Swedes) was drilled in on the 15th and 16th of June, The 
distance between the rows was 22 inches. 
In the course of a few days the seed germinated, and 
in about three weeks the plants were big enough to be 
singled. There was a regular plant on all the 16 experimental 
plots. 
The swedes manured with dissolved coprolites had slightly 
the start over the others. 
On the 8th of August, when I inspected the swedes, those 
manured with dissolved coprolites were stronger than those on 
