Thirteen Samples of Peruvian Guano. 



543 



All these guanos, it will be seen, contain very little moisture. 

 They are of a light brown colour, and in a fine powdery con- 

 dition. j\o. 3 has a lighter colour than the rest, and is remarkably 

 rich in ammonia. It is evidently a comparatively-speaking 

 recent guano deposit, and compares favourably with the best old 

 Chincha Island guano. 



The amount of ammonia in the four other samples varies from 

 8 to 13 per cent, in round numbers, and that of sand from 1^ to 

 DJ per cent. 



Excepting No. 4, the samples from Pabillon de Pica do not 

 contain so much ammonia as Chincha guano, and although dry 

 and powdery, without hard lumps, are inferior to the latter, 

 whilst as regards composition three of the samples nearly came 

 up to the standard of Guanape guano, and are greatly preferable 

 to the latter as reg-ards condition. 



PUNTA DE LOBOS GuANO. 



77*6 following is the Com];>osition of the Tliree Samjjles from these 

 Deposits : — 



No. 1. No. 2. 



No. 3. 



Moisture 



'^Organic matter and ammonia salts . 



Phosphate of lime 



-f Alkaline salts 



Insoluble siliceous matter 



*ContainiDg nitrogen 



Equal to ammonia 



-j-Containing phosphoric acid 

 £qual to tribasic phosphate of lime 

 Total phosphoric acid' 



14-53 

 35-77 

 26-50 

 20-35 

 2-85 



14-06 

 49-74 

 21-40 

 13-45 

 1-35 



100-00 ' 100-00 



4-79 

 17-14 

 23-09 

 27-04 

 27-94 



100-00 



2-64 



3-21 



•38 



•84 



10-95 



The deposit taken at 8 feet from the surface (No. 3), it 

 appears, is mixed with a good deal of sand ; it contains also 

 a large proportion of alkaline salts, and in consequence is poor 

 in ammonia. At 20 feet the Punta de Lobos sample yielded 

 8 per cent, of ammonia, and at 40 feet below the surface, 

 12 per cent. 



The 40 feet deposit is a dry and fine guano. It is much drier 

 than Guanape guano, and contains as little sand and as much 

 ammonia as good Guanape guano on an average. 



