YARDDUNG. 373 



same proportion of phosphate of lime. They con- 

 sist of :— 



Phosphate of lime 546 



Carbonate of lime 113 



Salts 19 



Organic matter 322 



1000 



1001. The bones of pigs contain 520 parts of 

 phosphate of lime, 10 parts carbonate of lime, and 

 470 parts organic matter and water ; those of calves, 

 540 phosphate of lime, and 460 animal matter and 

 water. The bones of fishes, generally speaking, con- 

 tain less earthy matter than those of land animals. 

 The bones of the cod-fish contain 480 phosphate of 

 lime, 55 carbonate of lime, 20 phosphate of mag- 

 nesia, 6 salts of soda, and 440 organic matter and 

 water. 



1002. The composition of farmyard dung, and 

 all mixtures of animal and vegetable manures, is very 

 variable. The following analysis of Boussingault 

 may be considered as expressing very nearly the 

 average composition of good yard dung : — 



Fresh. Dry. 



Carbon 74 358 



Hydrogen 9 42 



Oxygen 53 258 



Nitrogen ...... 4 20 



Inorganic 67 322 



Watfer 793 — 



1000 1000 

 32 



