NITROGENIZED PHOSPHATIC MANURES. 283. 



TABLE LXXXIIL— ANALYSES OF GUANO FROM MIDDLE BED OF 



PERUVIAN GUANO DEPOSITS. 



Oxalate of ammonia 



Carbonate of ammonia . 



Urate of ammonia 



Alkaline urates 



Nitrogenized organic matter 



Phosphate of potash 

 „ soda 



,, ammonia . 



„ lime (monacid) 



Carbonate of lime . 



Sulphate of potash . 

 „ lime 



Magnesia and chlorine . 



Moisture 



100-00 



100-00 



The lower beds of the deposit consist chiefly of salts of the 

 alkaline earths, and the aggregations which are met with have also- 

 the same composition. It is sulphate of potash which predominates- 

 in the nodules of these beds. The following is the analysis of one 

 of these nodules, according to Kraut : — 



TABLE LXXXIV.— ANALYSIS OF PERUVIAN GUANO NODULES 



100-00 



As observed above, the percentage of nitrogen in Peruvian guano 

 varies between 3-76 and 9-34, it is therefore much lower than about 

 1860. The Chincha islands deposits have a composition some- 

 what like those of the old guano, as the following analyses of the 

 Halle experimental station show. 



The guano of different cargoes contained (see Table LXXXV^ 

 p. 284). As will be seen further on, guano is no longer sold except 

 in the dissolved state. As guano, leaving its nitrogen out of account, 

 consists mainly of phosphoric acid, in the form of phosphate of lime, 

 it is, most generally, insoluble in the crude state. In certain very 



