158 MANUftU. 



gen, should be nearly 34 times stronger than 100 

 lbs. of fresh cow dung. Connected with flocks and 

 wool, there is a very valuable product, rich in all 

 the elements of manure, which is often lost or not 

 used for agricultural purposes, namely, the sweat, or 

 natural soap of wool. Fresh clipped wool loses 

 from 35 to 45 per cent, of its weight by washing. 

 This is due to a peculiar matter exuded from the 

 Wool, and which consists chiefly of potash, lime, 

 and magnesia, united to a peculiar animal oil, form- 

 ing an imperfect soap. It is remarkable that this 

 soap of lime, in all other cases insoluble, is here 

 soluble in water. The experience of the best French 

 agriculturalists, is full of testimony to the good ef- 

 fects of this wool sweat. It has been calculated 

 that the washings from the wool, annually consumed 

 in France, are equal to manuring 370.000 acres of 

 land. 



223. Bones consist of variable proportions of 

 cartilage, bone earth, and carbonate of lime. The 

 bone earth may be estimated at one-half the weight. 

 It is a peculiar phosphate of lime, containing 8 parts 

 of lime to 3 of phosphoric acid. A great part of the 

 value of bone as manure, depends on its cartilage. 

 The animal part of bones being one-third of their 

 weight, the ammonia is equal to 8 to 10 times that 



