236 On the Mamiring of Grass Land. 



" The difficulty of getting any quantity of liquid to filter tlirough a really 

 strong clay is such, that though eight ounces of water were poured into the 

 ]3crcolators, nearly three weeks elapsed before three ounces had passed through, 

 and this quantity was, therefore, experimented on. The result was as fol- 

 lows : — 



In water which had filtered through. 



(1 gr. sulphate of lime. 

 10 grs. of sulphate of ammonia added to A .. <0'5 organic matter, 



( Trace of ammonia. 



10 grs. sesquicarbonate of ammonia in B .. •in, 



0'5 organic matter, 

 race of ammonia. 



The very small quantity of mineral substances obtained from the Avater filtered 

 through clay was so remarkaVile, as in the first instance to cause the result to 

 be imrecorded, on the supposition that some accidental circumstance must have 

 occurred to vitiate the experiment, and it was repeated with every attention 

 and care. The result is given above. 



" !My main object in making these experiments had now been attained, and 

 I had convinced myself that either sandy, clayej-, or black vegetable soils, ]!os- 

 sessed the power of retaining a much larger amount of ammouiacal salts than 

 they receive in the most liberal manuring. 



" The weight of the column of soil operated on (8 inches dee])) was 2 lbs., 

 and to this 10 grs. of carbonate or sulphate of ammonia were added, which is 

 equivalent to an application of I85 cwt. per acre !"* 



The following composts may assist In showing liow grass nmy 

 be dressed without fold dun"-. Near towns where dun<r can be 



o 



purchased, it may be used : — 



£. s. d. 



Manure, 3 tons, at 5s 15 



Cartage, per ton 2s. M 7 6 



Earth cartage, 3 tons, at Is 3 



Common salt, 1 cwt., at Is 10 



Mixing, at 'id. per ton 1 G 



Turning, at 3cZ 1 (5 



Watering with liquid manure twice, saj^ .. 2 



Cartage and spreading, at Is G 



£L 17 G 



Where shoddy can be obtained but manure cannot: — 



£. s. .7. 



Shoddy, 1 ton, at 20s 10 



Earth, 3 tons, at Is 3 



Bone- ash, 1 cwt., at 5s 5 



Conmion salt, 1 cwt., at Is 10 



Sulphate of magnesia, ^ cwt., at '.s 2 6 



Watering twice 020 



Mixing, at 3'i. per ton 10 



Turning twice, at 3c/ 020 



Cartage and spreading, at Is 4 



£2 G 



* Journal, vol. xi. pp. 71, 72. 



