17-i 



MANURE. 



latitude. It there forms immense beds, from 60 to 80 feet 

 thick. What a length of time must have elapsed, or how 

 incredible the number of birds, to have produced that pile 

 of guano, whose base, washed by the sea, was observed by 

 our countryman, Mr. Blake, to stretch a mile in length, and to 

 tower 800 to 900 feet high ! The composition of ancient guano, 

 countenances the idea of its being the excrements of birds. 

 212. The following table presents the constituents of 

 guano, as determined by several chemists. 



3 05 ? 



Urate of Ammonia, 



Ammonia, , 



Uric Acid, , 



Oxalate of Ammonia, , 



" " Lime, , 



Phosphate of Ammonia, 



" " Lime, 



" " Ammonia and Magnesia 



« " Soda, 



Muriate of Soda, 



Sulphate of Soda, 



" " Potash 



Muriate of Ammonia, 



Clay and Sand, 



Water and organic matter , 



16. 



12.75 



0.5 



32. 

 28.75 



14.3 



3.3 

 5.5 

 4.2 

 4.7 



14.3 

 2.6 



3.8 

 6.5 

 4.2 

 4.7 

 32.3 



3.24 



13.35 

 16.36 

 6.46 

 9.94 

 4.19 

 5.29 

 0.10 

 1.19 

 4.22 

 6.50 

 5.90 

 28.31 



13.t 



26. 



14 

 61.§ 



30.5 



36.5 



* Included with water and organic matter. 



t Oxalate amm. included. 



X From crop of the birds. 



^ Includes urate of amm. and 11. water. 



