Chapter 4

_MINUTE AND GRADUAL MODIFICATIONS._

There are difficulties as to minute modifications, even if not fortuitous.--Examples of sudden and considerable modifications of different kinds.--Professor Owen's view.--Mr. Wallace.--Professor Huxley.--Objections to sudden changes.--Labyrinthodont.--Potto.--Cetacea.--As to origin of bird's wing.--Tendrils of climbing plants.--Animals once supposed to be connecting links.--Early specialization of structure.--Macrauchenia.--Glyptodon.--Sabre-toothed tiger.--Conclusion ... _Page_ 97

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