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Published online by Cambridge University Press: 01 May 2009
1 Reprinted from Science, n.s., vol. x (1899), No. 240, pp. 146, 147.Google Scholar
2 “Das Wadi Natroun in der libÿschen Wüste und seine niedern Thiere,” Bd. xxii (1899), pp. 53–61.Google Scholar