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OcToBER 24, r895] NATURE be found on comparing pp. 191 and 313. On p. 191 we baYe a short abstract of an article on petroleum, by A. Riche and G. Halphen. On p. 313 we haYe a long abstract of the same article. In one case it is given under qualitative organic chemistry, in the other under quantz'tatz've organic chemistry. Vet the reference in each case is the same-" f. Pharm. Chim.,doi:10.1038/052619b0 fatcat:xqnqvxekavfkpcxq6de5phxz6m