330 



BOARD OF AGRICULTURE. 



Mineral Phosphates. 



I.— Orchilla Guano. 



This mineral phosphate is named after the Island Orchilla 

 (in the Caribbean Sea) , which belongs to Venezuela. 



The amount of this phosphate is still large according to 

 the statements of Messrs. B. M. Rhodes & Co., of Balti- 

 more, who act as importers' agents. The material consists 

 mainly of tricalcic or bone phosphate (55 to 65 per cent.) 

 and of carbonate of lime. In its natural state it forms a soft, 

 pulverulent mass, of a yellowish white color, and contains but 

 traces of organic matter. 



The samples tested have been secured from different parties. 



II. — EsTRELLA Guano. 



Phosphoric acid. 

 Lime, 

 Sulphuric acid. 



Moisture, 



Represented. 



26.0 to 27.5 



This article resembled, in its fine mechanical condition, the 

 former; yet contained a somewhat larger percentage of 



organic matter. 



