On the Phosphatic Guano Islands of the Pacific Ocean
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Jour. Sci.— Second Sebies, Vol. XXXIV, No. 101.— Sept., 1S63.
30 12 J. D. Hague on the Guano Islands of the Pacific Ocean.
ticallj the section shows a series of concentric layers above and around this central mass. The exterior is almost pure phosphate, and, proceeding from the outside towards tlie centre, each suc- cessive layer has less phosphate and more sulphate until the central mass is reached, which is almost pure sulphate. It is worthy of note that this hj^drated sulphate of lime, which... inva- riably fills the centre of a "hummock," is amorphous and ex- ceedingly fine and soft, even when the underlying gypsum is crystalline. These hummocks are scattered over certain parts of the deposits and occur in close proximity to each other. In these places the deposit is invariably damp, and, usually, be- neath each one may be found, mixed with the underlying sul- phate, a black, earthy and damp substance containing much phosphate and some carbonate of lime. This black substance was, probably, coral mud, in which, as in the coral pseudomorphs of Howland's, the carbonic acid has been expelled and replaced by phosphoric acid, and this affords the only explanation that I can offer for this remarkable formation, namely, that in the chemical interchange that must have taken place between the soluble salts washed down from the guano on the surface, the sulphate of lime and the coral mud, there may have been an ex- cess of carbonic acid liberated from the latter and replaced by phosphoric acid.
What to read after On the Phosphatic Guano Islands of the Pacific Ocean?
You can find similar books in the "Read Also" column, or choose other free books by Ya Pamphlet Collection (Library of Congress) Dlc to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Jour. Sci.— Second Sebies, Vol. XXXIV, No. 101.— Sept., 1S63.
30 12 J. D. Hague on the Guano Islands of the Pacific Ocean.
ticallj the section shows a series of concentric layers above and around this central mass. The exterior is almost pure phosphate, and, proceeding from the outside towards tlie centre, each suc- cessive layer has less phosphate and more sulphate until the central mass is reached, which is almost pure sulphate. It is worthy of note that this hj^drated sulphate of lime, which... inva- riably fills the centre of a "hummock," is amorphous and ex- ceedingly fine and soft, even when the underlying gypsum is crystalline. These hummocks are scattered over certain parts of the deposits and occur in close proximity to each other. In these places the deposit is invariably damp, and, usually, be- neath each one may be found, mixed with the underlying sul- phate, a black, earthy and damp substance containing much phosphate and some carbonate of lime. This black substance was, probably, coral mud, in which, as in the coral pseudomorphs of Howland's, the carbonic acid has been expelled and replaced by phosphoric acid, and this affords the only explanation that I can offer for this remarkable formation, namely, that in the chemical interchange that must have taken place between the soluble salts washed down from the guano on the surface, the sulphate of lime and the coral mud, there may have been an ex- cess of carbonic acid liberated from the latter and replaced by phosphoric acid.
What to read after On the Phosphatic Guano Islands of the Pacific Ocean?
You can find similar books in the "Read Also" column, or choose other free books by Ya Pamphlet Collection (Library of Congress) Dlc to read onlineMoreLess
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