COMMERCIAL FERTILIZERS. 



341 



Marl. 

 (Sent by Hon. Elizar Smith, Lexington, Mass.) 



JNIoisture at 100° C. 



Dry matter at 100° - 110° C. 



Organic matter 



Carbonate of lime . 



Carbonate of magnesia . 



Oxide.s of iron and alumina, witli traces of phosphoric 



acid .... 

 Insoluble matter 

 Phosphoric acid and nitrogen 



Per cent. 



55.80 



44.20 



3.44 



37.00 



.57 



.70 



2.49 



Traces. 



This marl is noticeable on account of its deficiency in phos- 

 phoric acid and iji magnesia compounds. Its superior me- 

 chanical condition renders it a valuable material wherever 

 application of carbonate of lime is advisable. 



Orchilla Guano. 

 (From Messrs. Horton & Phelps, Northampton, Mass.) 



This sample, like those described in previous reports, rep- 

 resented in its natural condition a fine, pulverized material, 

 which contained from thirty-nine to forty per cent of bone- 

 phosphate. Its fitness for the incorporation in barnyard- 

 manure, and direct application upon turfy lands, has been 

 repeatedly pointed out. 



Nitrate of Potussa. 

 (From Bowker Fertilizer Co., Boston, Mass.) 



Moisture .... 



Potassium oxide 



Calcium oxide and sulplniric acid 

 Insoluble matter 



Per cent. 

 1.75 

 . 45.62 



. Traces. 

 . Trace. 



The above sample represents a good standard article of its 

 kind, containing from ninety-five to ninety-six per cent of 

 nitrate of potassa. The price of this chemical, which is from 

 a hundred and sixtv-fivc to a hundred and seventy dollars 



