Geological Observations on the Volcanic Islands and Parts of South America Visited During the Voyage of H M S 'Beagle'

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General Books LLC, 2009 - Science - 406 pages
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. 1876 edition. Excerpt: ...before the common salt on the muddy bottom.2 The association of gypsum and salt in this case, as well as in the superficial deposits of Iquique, appears to me interesting, considering how generally these substances are associated in the older stratified formations. 1 According to Azara ('Travels.' vol. i. p. 56) there are 6alt lakes as far north as Chaco (lat. 2.5), on the banks of the Vermejo. The salt lakes of Siberia appear (Pallas s ' Travels, ' English Trans, vol. i. p. 284) to occur in very similar depressions to those of Patagonia. 'Voynse Geolog, ' p. 63. Prof. Ehrenberg examined some of this muddy sand, but Tras unable to find in it any infusoria. 1 'Voyage Geolog.' p. 64. This is what might have been expected; for IT. Ballard asserts ('Acad, des Sciences, ' Oct. 7, 1844) that sulphate of soda is precipitate 1 from solution more readily from water containing muriate of soda in excess, than from pure water. Mr. Reeks has analysed for me some of the salt from the salina near the Rio Negro, he finds it composed entirely of chloride of sodium, with the exception of 0-26 of sulphate of lime and of 022 of earthy matter: there are no traces of iodic salts. Some salts from the salina Chiquitos in the Pampean formation, is equally pure. It is a singular fact, that the salt from these salinas does not serve so well for preserving meat, as sea-salt from the Cape de Verde Islands; and a merchant at Buenos Ayres told me that he considered it as fifty per cent, less valuable. The purity of the Patagonian salt, or absence from it of those other saline bodies found in all sea-water, is the only assignable cause for this inferiority; a conclusion which is supported by the fact lately ascertained,1 that those salts answer best for preserving cheese which...

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About the author (2009)

Richard Darwin Keynes is Emeritus Professor of Physiology at the University of Cambridge, and fellow of Churchill College, Cambridge. In parallel with research and teaching on physiology and biophysics, he has a long-standing interest in the voyage of the Beagle, and has also edited The Beagle Record (1979) and Charles Darwin's Zoology Notes and Specimen Lists from the H. M. S. Beagle (2000).

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