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Published online by Cambridge University Press: 01 May 2009
page 76 note 1 M. Delesse does not seem to have used polarized light in ascertaining the flinty or quartzose origin of grains of sand. (See Nature, 9th 05, 1872.)Google Scholar
page 77 note 1 The subject has since been enlarged on by M. Daubrée in a paper noticed in the Geological Magazine, 1873, Vol. X. p. 472.Google Scholar