364 PRACTICAL GARDENING. 



Water 65 



Urea 5 



Bone-dust 5 



Sal ammoniac and muriate of potash . . 15 



Sulphate of potash 6 



Carbonate of potash and ammonia ... 4 



100 



Compare this ^vith the dung of the cow. It appears already 

 that 100 lbs. of dung afford 2 lbs. 2 oz. of carbonate of am- 

 monia, while this gives 5 lbs. of ammonia in its urea, and 

 nearly three times 5 lbs. in its other ammoniacal salts ; in 

 short, 100 lbs. afford 35 lbs. of the most powerful salts ever 

 used by farmers. 



The liquid evacuation of the horse contains — 



Water 94-0 



Urea '7 



Chalk 1-1 



Carbonato: of soda '9 



Hippurate of soda 2*4 



■ Muriate of potash '9 



100-0 



It is thus equal in value to cow-dung, pound for pound ; 

 but when we come to the subject of waste, the author of the 

 "Muck Manual" tells us that every man wastes annually 

 enough salts to manure an acre of ground. The liquid evacu- 

 ations are equal in value to that of the cow : the analysis is 

 not in all respects the same, but the value is. According to 

 Dr. Thompson's analysis, the contents of 1,000 lbs. are more 

 than 42 lbs. of salts, for there is not an ingredient that is not 

 essential to plants. The analysis is as follows : 



Sal ammoniac '459 



Sulphate of potash 2*112 



Muriate of potash 3*674 



Common salt 5'060 



Phosphate of soda 4*267 



Bone-dust, phosphate of lime . . '209 



Acetate of soda 2*770 



Urate of ammonia '298 



Urea, with colouring matter . . . 23*640 



Water 967*511 



1,000*000 



