98 
Artificial Manures for Swedes. 
into ten different plots of one-eighth of an acre each. These 
experimental plots were arranged side by side in continuous rows 
of drills, care being taken to reject the headlands from the experi- 
mental plots. The space of one-eighth of an acre was occupied 
by three rows of drills. The different manures were all applied 
to the land on the same day ; and in order to secure their full 
efficacy and their even distribution, they were put on the ridges 
by hand in a groove, made by a hoe being drawn along the top ; 
the different manures were then covered with some soil, and after 
passing a roller over the drill, all the swedes were sown by ridge- 
drill on the 2()th of June. Subsequently, all experimental plots 
were treated in piecisely the same way, and care was taken to 
render the experiments in every respect strictly comparative. 
One of the experimental plots was left unmanured ; the nine 
remaining were manured in the manner described, with the sub- 
joined quantities of the manures, which have been mentioned 
already. These quantities of the different fertilisers were obtained 
in each case with an expenditure of 5s., or each experimental 
plot was manured at the rate of 21. per acre. 
Thus to 
Cost, OS. for eacli Plot. 
Plot I. was applied . 56 lbs. of guano. 
,, II. . 84 lbs. of coprolitps, dissolved in sulphuric 
acid, and 28 lbs. of guano. 
III. „ „ . 100 lbs. of bone-dust. 
IV. ,, . 93 lbs. of home-made superphosphate. 
V. ,, . 56 lbs. of economical manure. 
VI. ,, ,, . 120 lbs. of nut-refuse. 
VII. ,, . 140 lbs. of dissolved coprolites. 
VIII. ,, ,, . Nothing. 
IX. ,, ,, . 180 lbs. of commercial dried night-soil. 
X. ,, ,, .A mixture of 1 bushel soot, 30 lbs. of guano, 
with dissolved coprolites, and super- 
phosphate of bones. 
Before stating the yield of each experimental plot, I may be 
permitted to ofi'er some observations on the condition of the 
growing crops, and on the chemical composition of the different 
fertilisers used in these experiments. All have been analysed in 
my laboratory, either completely, or when a complete analysis 
appeared superfluous, only those substances were determined on 
which principally the efficacy of the manure depended. 
Plot I. Manured with 56 lbs. of guano, or at the rate of 4 cwts. per 
acre. 
Cost of manure 5s., or 21. per acre. 
The young plants came up remarkably well, and looked for 
a considerable time as well, if not better than the rest of the 
experimental plots. When, howevei, the bulbs began to swell, 
it was evident to the eye that the guano turnips would be left 
