Composition and Value of Guano, 

 Table 7. — Angamos Guano. 



209 



The Specimens 50 and 51 were analyzed by Dr. Ure. Speci- 

 men 49 was purchased by the person who placed it in my hands 

 for analysis in the ordinary way of business from a country dealer. 

 I have no knowledge of its history ; but as it closely corresponds 

 with the other samples of Angamos guano^ I have ventured to 

 place it side by side with them. 



At the same time it is obvious that the difference between this 

 kind of guano and the best specimens of Peruvian is very trifling, 

 since there are in the Tables several cases in which the proportion 

 of ammonia approaches 19 per cent. 



We now proceed to the other and inferior varieties, taking them 

 in the order of ammoniacal value. The Ichaboe guano, therefore, 

 naturally presents itself first on the list. 



Under this head I can offer no results of my own. The analyses 

 given below were made by Dr. Ure and Mr. Teschemacher. 



The relation in composition between the Peruvian and Ichaboe 

 guanos is at once seen : with less than half the proportion of am- 

 monia, the latter contains a slightly increased quantity of earthy 

 phosphate. That the last-named advantage can in no way com- 

 pensate for a deficiency in ammonia will be better seen when the re- 

 lative value of these ingredients is ascertained. Of the ammonia — 



VOL. X. p 



