NITEOGENIZED PHOSPHATIC MANUEES. 287 



Other Nitrogenized Guanos. — Amongst other nitrogenized 

 .guanos, mention must be made of Ichaboe guano (Ichaboe is an 

 island on the West Coast of Africa). This manure has been known 

 for a long time, but was never of very great commercial importance, 

 because the first arrivals only contained 8 per cent of nitrogen and 

 20 per cent of phosphoric acid ; those which followed tested less and 

 less. Ichaboe guano rather approaches phospho guanos. Latterly 

 new deposits of guano have been found on the island of Ichaboe, 

 formed by sea-fowl, and not damaged by moisture. The percentage 

 •of nitrogen in this guano, which contains feathers and the un- 

 decomposed carcases of birds, rises to 14:"4 per cent, and its 

 phosphoric acid content to 17*6 per cent. 



Different deposits of guano were discovered a long time ago 

 on different points of the African coast, such as those of Algoa Bay, 

 Saldanha, and those of Cape Colony. But these deposits, almost 

 a,ll exhausted by moisture, never had a great importance. 



Seal Guano. — Seal guano has been found in several parts of 

 the West Coast of South America, in the Bav of Ferrol, in the 

 Lobos Isles, and in the Isle of Tortuga. The^e deposits are even 

 now the habitat of seals, so that they are incessantly being formed. 

 In the Lobos Isles, the guano forms a bed 70 metres (say 230 feet) 

 thick at many points ; it consists chiefly of the carcases of animals, 

 bones, fur, hair, etc., all slightly soluble substances. This guano 

 <3ontains much less nitrogen than true Peruvian guano ; it is analo- 

 gous to the guanos of the lower bed of the Chinchas deposits above 

 mentioned. 



Bat Guano. — There was formerly on the market a guano of 

 this kind, under the name of Sarde guano. Stockhardt found in 

 that product : — 



TABLE LXXXVI.— ANALYSIS OF BAT GUANO. 



Per cent. 

 Nitrogen . . . , ' . . . . 2-0o 



Phosphate of lime 35-30 



Alkaline salts 3-60 



It consists chiefly of bat excrements mingled with the dead 

 bodies of these animals. Bat guano is found in grottoes and rock 

 fissures, on the shores of the Mediterranean, in Brazil, Hungary, 

 France, near Vesoul in Egypt. The largest deposit up to now is 

 that of Kolumbacz, on the Danube, which contains 4000 tons of 

 guano. 



Hungarian Bat Guajio contains, according to Scheibler, 1-88 per 

 cent of nitrogen and 11-64: per cent of insoluble phosphoric acid ; 

 it is only, therefore, of small value. The guano found in the 



