3G2 



BOARD OF AGRICULTURE. 



Phosphoric acid, 

 Nitrogen, . 

 Potassium oxide, 

 Sand, etc., . 



15.90 

 7.23 

 1.80 

 1.60 



Sample No. I. consisted of a light brown, loose pulveru- 

 lent mass interspersed with a yellowish-white granulated sub- 

 stance ; it lost at 100° C. 20.59 per cent, of its weight, and 

 left, after a careful calcination, 41.7 per cent, of ash constitu- 

 ents. Its actual ammonia amounted to 7.7 per cent, (equal 

 to 6.33 per cent, of nitrogen), leaving thus 1.83 per cent, 

 of nitrogen as potential ammonia (equal to 2.23 per cent, of 

 ammonia) ; 13.74 per cent, was soluble in a solution of citrate 

 ammonia (of 1.09 spec, grav.), leaving 3.98 per cent, undis- 

 solved. This guano proved thus to be a good quality of its 

 kind. 



Sample No. II. formed a moist, lumpy, brown mass. It 

 had been somewhat damaged by water on board the vessel on 

 its way from New York. The bags containing it were more 

 or less covered with a yellowish-white incrustation ; they were 

 kept removed from the stock of the good quality and sold, it 

 was stated, at a lower price. 



In treating on Peruvian guano, in my first report, I stated 

 that in a good quality of Guanape guano both nitrogen and 

 phosphoric acid were still sold at a lower rate than in most 

 other commercial fertilizers, 3 r et I advised our formers to 

 bear in mind that inferior Peruvian guanos were by no means 

 of rare occurrence. 



The following variations in the composition of Peruvian 

 guano have been kindly communicated from other important 

 markets of that article. 



[From Charleston, S. C. : Professor C. TJ. Shepard, Jr., M. D.] 



The Chincha guano has varied during the years 18G9 to 

 1873, as follows :— 



