GUANO. 43 



Water, 1!.0 



}. Phosphate of lime, 25.0 



Phosphate of ammonia, ammonia, phosphate of magnesia, together 



containing from five to nine per cent ammonia 13.0 



Silicious sand, 1.0 



100.0 

 \.nalysis of a specimen of African guano by Dr. Ure, gives 



. Saline and organic matter containing ten parts pure ammonia, 50.0 



L Water 21.5 



1. Phosphate of lime and magnesia and potash, 26.0 



'. Silica, , 1.0 



. Sulphate and muriate of potash 1.5 



100.0 



Many other analyses might be given showing the composition 

 f the different varieties, as it varies considerably from diff'erent 

 Dcalities, even in different cargoes, from the same deposit ; but 

 lie general results of these analyses show the guano from the 

 'acific to be superior to the African. 



In order to determine the purity of guano it is only necessary 

 l> mix a small quantity of guano with about ten parts of chalk 

 jid one part of quick lime, let them then be intimately blended, 

 hen they should give off" a strong smell of ammonia ; next, moisten 

 [glass rod with muriatic acid, this held over the mixture should 

 '•oduce a strong evolution of white vapor. This will determine 



e presence of ammoniacal salts. In a crucible heat to redness 

 iismall quantity ; this should reduce it to a white ash, when if 

 ipod, the ash will be nearly soluble in dilute muriatic acid. 

 IThe diff'erent analyses of guano show it to be composed, in an 

 ainent degree, of those substances considered as most useful in 

 lanures. 



(Numerous experiments have been made in England, for the pur- 

 jise of determining the value of guano as compared wdth other 

 Janures ; both as regards the beneficial effects upon the soil, and 

 te relative cost of the application. These experiments have been 



ried and tried upon all crops raised in England and Scotland, 



d by scientific men, and have the merit of authenticity. The 

 rmlts seem to establish guano, in relation to other efficient 

 nnures, such as bone dust, barn-yard manure, &c., as four of the 

 f -mer to five of the latter. 



The most approved method of applying guano, is to mix it with 



