722 



BOAED OF AGRICULTURE. 



MaH. 



[I. and II. Sent on from Baltimore, Md. III. Sent on from South Framingham, 



Mass.] 



I. and II. Are samples of "green marl;" they belong 

 to a valuable class of marls. 



III. Tills material, sent on " as a sample of marl," is 

 essentially a carbonate of lime of fine aggregation and of a 

 soft texture ; and for this reason it deserves recommenda- 

 tion for agricultural purposes, wherever an addition of lime 

 will benefit the soil in the interest of the crops raised upon it. 



Peruvian Guano. 



[Sent on from Taunton, Mass.] 



Moisture at 100° C, 



Total phosphoric acid, .... 



Solul^lc phosphoric acid (8 cents per pound), 

 Reverted phosphoric acid (7| cents per pound) 

 Insoluble pliosphoric acid (3 cents per pound), 

 Totassium oxide (4^ cents per pound). 



Total nitrogen, 



Actual ammonia (17^ cents per poimd), 

 Organic nitrogen (17^ cents per pound), . 

 Nitrogen as nitric acid (16 cents per pound). 

 Insoluble matter, 



Valuation per 2,000 pounds, 



Per pent. 



12.17 



18.45 

 1.54 

 5.92 



10.99 

 3.46 

 5.13 

 3.94 

 0.86 

 0.33 



13.64 



$38 74 



