Report of Experiments on the Growth of Wheat. 110 
hydrochloric instead of 150 lbs. sulphuric acid), 300 lbs. sulphate 
of ammonia, and 500 lbs. rapc-cako. 
Plot 19.— 200 lbs. bone-ash, 200 lbs. hydrochloric acid, 300 lbs. sul- 
phato of ammonia, and 500 lbs. rape-cake. 
The sulphates of potass, soda, and ammonia, the muriate of . 
ammonia, and the nitrate of soda, were the ordinary articles of 
commerce passing under those names ; the sulphate of magnesia 
was Epsom salts. In the following Tables, and discussion, the 
term "ammonia-salts" will, for brevity, be employed to desig- 
nate the equal mixture of the sulphate and muriate of ammonia. 
The only exception to the above statement of manuring for 
each of the last 12 years is, that in the first two of them, namely, 
1852 and 1853 (and also in the immediately preceding year, 
1851), chloride of sodium, or common salt, at the rate of 3 cwts. 
per acre per annum, was applied to Plot 16 a, in addition to the 
manures enumerated above for that plot. 
In the few comments which now follow on the produce of each 
separate season, with the view of showing the varying effects of 
one and the same manure according to season, but little reference 
will be made either to the varying condition of the different plots 
due to the varying character of the manuring during the pre- 
ceding eight years, or to that attributable to use of the same 
manure year after year on the same land ; leaving the important 
question of the limit, or degree, of the effect of accumulation or 
exhaustion from previous manuring and cropping on the pro- 
duce of succeeding seasons, for entirely separate consideration 
further on. 
Ninth Season, 1851-52. 
October (1851) was, for the most part, fine and mild ; No- 
vember fine, but very cold ; December less severe ; January and 
February (1852) mild, with a good deal of rain ; March dry and 
clear, but cold and frosty ; April dry, with some hot sun, but a 
good deal of cold east wind ; May variable, but with a good deal 
of cold east wind ; June very wet and cold; July very hot, with 
several heavy thunderstorms ; August, fine at the beginning, very 
wet in the middle, and fine and hot at the end ; September, fine 
until the 6th, when there was a heavy thunderstorm, with a good 
deal of rain, the rest of the month being variable, with pre- 
vailing low temperatures, but upon the whole not unfavourable. 
In June the dew-point was below, but the degree of humidity 
of the air slightly above the average ; in July the dew-point 
was above, but the degree of humidity considerably below the 
average ; and in August and September both dew-point and 
degree of humidity were notably below the average. 
The winter was, therefore, upon the whole, favourable ; the 
