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Updated: May 17, 2025
According to Latreille, the pediculus found in the woolly heads of African negroes 'is sufficiently distinct from that of the Circassian to entitle it to the rank of a distinct species; from which, and similar instances, the doctor concludes: 'Whatever may be urged in behalf of the hypothesis of the unity of the animal creation, based upon the alleged metamorphosic changes of types, it is my opinion that the relations of their parasites, and especially the lice which are distributed over nearly all of them, must be considered as fair and full an argument as can be advanced against such hypothesis, for it is taking up the very premises of the hypothesis in opposition. Dr Burnett will perhaps find Sir Charles Lyell ready to break a lance with him on the point at issue.
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