148 
Report of Experiments on the Growth of Wheat, 
[App. 
Experiments at Bothamsted on the Geowth of 
Appendix. — Table II. — Manures and Produce ; 2nd Season, 1845. 
Manures ver Acre. 
Farm- 
yard 
Manure 
Silicate 
of 
Potass. 1 
Phos- 
phate 
of 
Potass. 2 
Super- 
phosphate 
of 
Lime. 2 
Tons. lbs. lbs. lbs. lbs. lbs. lbs. lbs. 
Mixture of the residue of most of the other manures 
Bone- 
ash. 
Muriatic 
Acid. 
Guano. 
Sulphate 
of 
Ammo 
112 
14 
Unmanured 
Unmanured 
280 
112 
112 
280 
112 
224 
224 
336 
Unmanured 
Mixture of the residue of most of the other manures 
221 
112 
112 
224 
112 
336 7 
672 8 
224 
112 
112 
112 
112 
168 s 
168 6 
224* 
224 
224 
56 
112 
112 
112 
Muriate 
of 
Ammo 
nia. 3 
lbs. 
16S 5 
168 6 
56 
112 
112 
Carbo- 
nate 
of 
Ammo- 
nia. 
lbs. 
252 3 
Rape 
Cake. 
lbs. 
560 
560 
560 
560 
560 
560 
280 
336 
Tapi- 
oca. 
lbs. 
560 
1 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 ; it was ground to powder 
under edge-stones. 
2 The manures termed superphosphate of lime and phosphate of potass were made by acting 
upon bone-ash by means of sulphuric acid, and in the case of the potass salt neutralizing the compound 
thus obtained by means of pearl-ash. For the superphosphate of lime the proportions were 5 parts 
bone-ash, 3 parts water, and o parts sulphuric acid of sp. gr. 1*84 ; and for the phosphate of potass 
4 parts bone-ash, water as needed, 3 parts sulphuric acid of sp. gr. l - 84, and an equivalent amount 
of pearl-ash. The mixtures, of course, lost weight considerably by the evolution of water and 
wrbonic acid. 
