296 
MESSRS. J. 13. LA WES AND J. H. GILBERT ON THE RESULTS OF 
a portion of it, the area being extended day by day, until the whole was eaten down. 
Frequently, however, the animals suffered so much, sometimes by the change of food, 
and sometimes by the combined influence of this and bad weather, that the plan was 
finally abandoned ; and in the years 1866, 1870, 1873, and 1874, the second crops 
(and third if any) were mown, evenly spread on the respective plots, and left to decay 
and manure the land. The estimated amount of the second crops, and the influence of 
the treatment of them as above described, on the produce of the succeeding years, will 
be considered further on. But, in the first instance, our illustrations will chiefly have 
reference to the produce of hay of the first crops only. 
A detailed description of the kinds and quantities of the manures applied to, and of 
the amounts of produce obtained from, each of the experimental plots, in each of the 
first twenty (and three subsequent) years, is given in Appendix-Table I., pp. 406-407. 
There is also given, in the same table, the average produce on each plot, over the first 
10, the second 10, and the total period of 20 years, or over the period before, and 
the period after, any important change in the manures. It will, however, be con¬ 
venient to give a general description of the manuring of each plot in this place. 
Plot 1.—Farmyard manure, and ammonia-salts,* 8 years, 1856-63; ammonia-salts 
only 1864, and each year since. 
Plot 2.—Farmyard manure, 8 years, 1856-63 ; unmanured 1864, and each year 
since. 
Plot 3.—Unmanured every year, 1856, and since. 
Plot 4-1.—Sawdust (without effect), 3 years, 1856-58 ; superphosphate of lime,t 
1859, and each year since. 
Plot 4-2.—Sawdust (without effect), 3 years, 1856-58 ; superphosphate of lime 
and ammonia-salts, 1859, and each year since. 
Plot 5.—Ammonia-salts alone, every year. 
Plot 6.—Ammonia-salts 13 years, 1856-68 (with sawdust 7 years, without effect); 
sulphates of potass, soda, and magnesia, and superphosphate of lime, 1869, 
and each year since. 
Plot 7.—Sulphates of potass, soda, and magnesia, and superphosphate of lime, 
every year. 
Plot 8.—Sulphates of potass, soda, and magnesia, and superphosphate of lime (as 
plot 7), 6 years, 1856-61 ; sulphates of soda and magnesia (without potass), 
and superphosphate of lime, 1862, and each year since ; also sawdust the first 
7 years, but without effect. 
Plot 9.—Sulphates of potass, soda, and magnesia, and superphosphate of lime (as 
plot 7), and ammonia-salts, every year. 
* “ Ammonia-salts,” in all cases equal parts, sulphate and muriate of ammonia of commerce. 
f “ Superphosphate of lime,” always composed as under, per acre: 200 lbs. bone-asb, 150 lbs. sulphuric 
acid (sp. gr. 1*7), and water. 
