POULTRY MANURE. 131 



Wagner* gives the following as the composition of three 

 samples of Peruvian guano : 



i. n. in. 



Ammonium chloride ... ... 2-25 6'50 4-2 



urate ... ... 12-20 3-24 9-0 



oxalate ... ... 17-73 13-35 10-6 



phosphate... ... 6-90 6-25 6-0 



,, carbonate ... ... 0-80 



,, bromate ... ... 1*06 



,, magnesium phosphate 11-63 4-20 2*6 



Sodium phosphate ... ... 5-29 



chloride ... ... 0-40 O10 



sulphate ... ... 4-92 1-12 3-8 



Potassium sulphate ... ... 4-00 4-23 5-5 



Calcium phosphate ... ... 20*16 9'94 14-3 



oxalate ... ... 1-30 16-36 7-0 



,, carbonate ... ... 1'65 



Sand and clay ... ... 1-68 5-90 4-7 



Water and organic matter ... 13-32 23-32 32-3 



100-00 99-80 100-0 



Pigeon and fowl dung. These substances, according to 

 Storer,f were formerly much prized as manures, and played 

 an important part in Eoman, Persian, and Egyptian hus- 

 bandry. In France, too, large dovecotes formerly constituted 

 an almost necessary adjunct to farmsteads. Their importance 

 has diminished since the introduction of nitrate of soda, 

 kainite, and other artificial manures. 



Storer gives as the percentage composition of the fresh ex- 

 creta of the common domestic birds 



Fowls. Pigeons. Ducks. Geese. 



Chemical Technology 1892, p. 424. t " Agriculture," Vol. I., _._ 



K2 



