68 On the Inorganic Constituents of Plants, 



2339 to 10000. One thousand seeds weighed 731 grains. The 

 standard measure full, weighed 4228 grains, consequently the 

 bushel would weigh 60^ lbs. The plants in this and the succeed- 

 ing square, No. 6, looked throughout rather better than those in 

 the two preceding squares Nos. 3 and 4 ; they were not, however, 

 so much better as to have rendered it probable that the crop 

 would be so much larger than Nos. 3 and 4, as the result proved 

 it to be. 



6. Common Salt and Silicate of Potash. Manured with these 

 substances at the rate of 3 cwt. of the former, and ly cwt. of the 

 latter, per acre, the produce was 



Straw 36 10 2 12 37 



Chaff 3 4 38 



The proportion of corn to the whole crop was therefore as 

 1721 to 10000. One thousand seeds weighed 654 grains. The 

 standard measure full weighed 4124 grains, consequently the 

 bushel would weigh 59 lbs. 



7. Miniate of Ammonia. Manured with this salt at the rate of 

 3 cwt. per acre, which, reckoning the salt worth £2. 2s. per cwt., 

 would cost £6. 6s. per acre. In almost all the experiments made 

 at the Horticultural Gardens with the salts of Ammonia, Muriate 

 of Ammonia has produced a greater effect than the Sulphate or 

 even the Phosphate. It is probable that this salt would for many 

 soils be a very valuable manure. The price just quoted, which is 

 that ordinarily stated, is however very high ; and it becomes a ques- 

 tion of some interest, whether it could not be obtained at a much 

 lower cost. The common Muriate of Ammonia or Sal Ammoniac, 

 is prepared chiefly from the Sulphate of Ammonia and Common 

 Salt, which are mixed and then heated in a subliming apparatus. 

 It is evident that for the purpose of manure, a more impure salt 

 than that prepared by sublimation might be used. Perhaps the 

 best process for preparing it would be to mix together Muriate of 



