146 
Report of Experiments on the Growth of Wheat. [App. 
Experiments at Eothamsted on the Growth of 
Appendix. — Table I. — Manures and Produce ; 1st Season, 1843-4. 
Manures per Acre. 
Farmyard 
Manure. 
Farmyard 
Manure 
Ashes. 
Silicate 
of 
Potass. 2 
Phosphate 
of 
Potass. 3 
Phosphate 
of 
Soda. 3 
„ . " 1 Super- 
Phosphate , p hosphate 
ot of 
Magnesia. 3 Lime .3 
Tons. Cwts. lbs. lbs. lbs. lbs. 
Mixture of the residue of most of the other manures 
14 
Unmanured 
32 1 
220 
275 
110 
110 
110 
110 
110 
Unmanured 
Mixture of the residue of most of the other manures 
325 
1871 
150 
75 
75 
162J 
65 
65 
65 
81 
420 
210 
210 
210 
168 
84 
84 
84 
105 
lbs. 
700 
700 
350 
350 
350 
630 
560 
350 
350 
350 
350 
350 
350 
350" 
350 
350 
Sulphate 
of 
Ammonia. 
lbs. 
65 
65 
65 
81 
Rape 
Cake. 
lbs. 
154 
308 
54 
1 The farmyard dung was burnt slowly In a heap in the open air to an imperfect or coaly ash, and 32 cwts, 
of ash represent 14 tons of dung. 
2 The silicate of potass was manufactured at a glass-house by fusing equal parts of pearl-ash and sand. The 
product was a transparent glass, slightly deliquescent in the air, which was ground to powder under edge-stones. 
3 The manures termed superphosphate of lime, phosphate of potass, phosphate of soda, and phosphate of 
magnesia, were made by acting upon bone-ash by means of sulphuric acid in the first instance, and in the cases 
of the alkali salts and the magncsian one neutralizing the compound thus obtained by means of cheap preparations 
of the respective bases. For the superphosphate of lime the proportions were 5 parts bone-ash, 3 parts water, and 
3 parts sulphuric acid of sp. gr. 1-84; and for the phosphates of potass, soda, and magnesia, they were 4 parts 
bone-ash, water as needed, 3 parts sulphuric acid ofsp.gr. 1-84, and equivalent amounts, respectively, of pearl-ash, 
