Excerpt from Edinburgh Medical Journal, Vol. 1 of 30: Containing the Monthly Journal of Medicine and the Edinburgh Medical and Surgical Journal, July to December, 1884
Although it may be admitted that some slow change or modification can hardly fail to take lace, as the combined result of individual variation and natural se eetion in the struggle for life, yet the question at once arises, whether variation has, or has not, its limits. For the Darwinian doctrine of evolution, it is necessary to assume that variation is practically unlimited. But it seems almost certain that, at all events along 'ven lines, there are limits to variation; and, in connexion wit this, I may advert to what Professor Cleland of Glasgow has ointed out, - that it seems very strange, if variation be unlimited, t at natural selection should have done nothing to advance the molluscan type during the countless ages that have elapsed since palaeozoic times, when the cephalopoda were as highly organized as they are at the present day.
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