The History Of A Lump Of Chalk; Its Family Circle, And Their Uses

Paperback | January 31, 2012

byAlexander Watt

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1883. Excerpt: ... require very careful examination in order to ascertain their mode of formation. Thus it has been observed that beds presenting the appearance of organic remains to the naked eye may yet be proved to be almost wholly composed of them when the microscope is employed and due precautions taken. In this manner many beds of the mountain limestone series of the British islands have been found replete with the remains of life where none were at first suspected. Even when, upon exposure to atmospheric influences, fossils of far larger dimensions, readily visible to the naked eye, and extending to half an inch or more in length and breadth, are found in fair abundance, it sometimes occurs that the ordinary fracture of the limestone bed may not readily show them. We do not here include remains of encrinites, echinites, and some other fossils which, from their rhomboidal fracture, a little practise will enable an observer readily to distinguish, but others where they are far from being easily detected. The most beautiful shells will occasionally thus present themselves upon searching a weathered surface, not a trace of which can be obtained by ordinary observation.--De la Beche. CHAPTER XI. Carbonate of Lime and Phosphate of Lime in Bones--Superphosphate of Lime as Manure--Guano--Rotten Stone: its doubtful origin. The solid structure of the bones of animals is due to the very large proportion of phosphate of lime and carbonate of lime which they contain. In the bones of the ox there is found, by analysis, 57-35 per cent, of phosphate and 3-85 of carbonate of lime. The former is the most important constituent, since it is from this source that phosphorus is obtained, and from which also a valuable fertilizing compound is prepared, termed superphosphate of lime. When b...

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1883. Excerpt: ... require very careful examination in order to ascertain their mode of formation. Thus it has been observed that beds presenting...

Format:PaperbackDimensions:28 pages, 9.69 × 7.44 × 0.06 inPublished:January 31, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217589995

ISBN - 13:9780217589994

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