In Plants And In Animals, Accidental Varieties, Formed Under Our Own Eyes, Have Become Fixed, And Have Been Propagated;* (* For Example, The Sheep With Very Short Legs, Called Ancon Sheep In Connecticut, And Examined By Sir Everard Home.

This variety dates only from the year 1791.) but nothing proves, that in the present state of human organization,

The different races of black, yellow, copper-coloured, and white men, when they remain unmixed, deviate considerably from their primitive type, by the influence of climate, of food, and other external agents.

These opinions are founded on the authority of Ulloa.* (* "The Indians [Americans] are of a copper-colour, which by the action of the sun and the air grows darker. I must remark, that neither heat nor cold produces any sensible change in the colour, so that the Indians of the Cordilleras of Peru are easily confounded with those of the hottest plains; and those who live under the Line cannot be distinguished, by their colour, from those who inhabit the fortieth degree of north and south latitude." - Noticias Americanas. No ancient author has so clearly stated the two forms of reasoning, by which we still explain in our days the differences of colour and features among neighbouring nations, as Tacitus. He makes a just distinction between the influence of climate, and hereditary dispositions; and, like a philosopher persuaded of our profound ignorance of the origin of things, he leaves the question undecided. "Habitus corporum varii; atque ex eo argumenta, seu durante originis vi, seu procurrentibus in diversa terris, positio coeli corporibus habitum dedit." - Agricola, cap 2.) That learned writer saw the Indians of Chile, of the Andes of Peru, of the burning coasts of Panama, and those of Louisiana, situated in the northern temperate zone.

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