SI 8 AGRICULTURAL TEXT-BOOK. 



carbonate of ammonia, common salt and sulphate of potash; 

 the insoluble part of phosphate of lime, with a little phos 

 phate of magnesia, &c. By fermentation it loses a portion of 

 its ammonia. Every farmer should carefully clean his fowl- 

 houses, at least once a week, and pack the dung in barrels with 

 plaster, dry peat, earth, and a little salt &c ; and in the spring 

 eow it on his wheat at the rate of 300 cwt to the acre. If 

 properly kept it differs but little from guano, for which $50 per 

 ton is now paid at our shipping ports. In Michigan, 10 bush 

 els more of wheat to the acre, might in many instances be thus 

 obtained. 



695. We give the following analyses of Guano, chiefly to show 

 the composition of what has proved to be the most valuable ma 

 nure in existence ; and the nearer we can cause other manures 

 to approach to it, the more perfect will our art become. It is 

 merely the dung of salt-water birds preserved in the dry regions 

 of the globe, chiefly on the coast of Peru. It has lately been 

 stated, from actual measurement, that unless other deposites are 

 discovered, and if the demand continues at the present height, 

 the whole will be exhausted within 9 years. A patent hr.s 

 lately been granted in Great Britain for the preparation of an 

 equivalent compound, at a lower price, from fish, fish offal, &c., 

 and salts. 



Analysis of 2 specimens of Peruvian Guano. ( Way.) 



Water, - - 1257 13.67 



Organic matter and Salts of ammonia, 33 (i7 52.97 



Sand and Silica, - -1.79 1.42 



Phosphoric acid, 20.21 14,56 



Sulphuric acid, - 4.00 S.52 



Lime, - 16.49 10.38 



Magnesia, - - 0.80 0.31 



Oxide of iron, 0.22 0.73 



Potash, 360 1.42 



Soda, - - 4.15 none 



Chloride of Potassium, - none 2.02 



