Composition and Value of Guano. 



203 



Table 3. — Peruvian Guano. 



The next analyses are those of samples sold to different persons 

 as good Peruvian guanos, but which are so low in ammoniacal 

 composition as to lead to a doubt of their genuineness : — 



Table 4. — Inferior Guanos. 



Number of Specimen . ... 



Water 



Organic Matter and Salts of Ammonia 



Sand 



Earthy Phosphates 



Alkaline Salts • 



Ammonia yielded by lOU parts. 



21 



19-74 



46-17 



2-46 



31*59 



•04 



100-CO 



11-89 



22 



11-29 

 46-45 

 2-63 

 26-71 

 12-92 



100-00 



10-41 



23 



11*22 

 34-68 

 5-44 

 21-09 

 25 • 7 1 



100 00 



12* 



The large proportion of ''alkaline salts" in the third speci- 

 men is due to the presence of a quantity of gypsum and common 

 salt with which the guano has been adulterated, whilst at the 

 same time the proportion of earthy phosphates has been kept up 

 probably by the mixture of a certain quantity of one of the 

 cheaper varieties of guano. 



The next specimens are from the importations of the latter 

 part of 1848 and the beginning of the present year (1849). 



The first 8 of the following table were taken from the ware- 

 housed cargoes by Mr, Lawes. Nos. 29 and 31 are duplicate 

 specimens of Nos. 28 and 30. 



* The result of two analyses closely agreeing. 



