Quote by Thomas H. Huxley

It is an error to imagine that evolution signifies a constant tendency to increased perfection. That process undoubtedly involves a constant remodelling of the organism in adaptation to new conditions; but it depends on the nature of those conditions whether the directions of the modifications effected shall be upward or downward.

Categories: science

Please suggest source details if you know: book, page, year, online article address (url), correction (different author...), etc.. Thanks.