With mankind some expressions, such as the bristling of the hair under the influence of extreme terror, or the uncovering of the teeth under that of furious rage, can hardly be understood, except on the belief that man once existed in a much lower and animal-like condition.
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Blushing is the most peculiar and most human of all expressions.
If the country were open on its borders, new forms would certainly immigrate, and this would also seriously disturb the relations of some of the former inhabitants. Let it be remembered how powerful the influence of a single introduced tree or mammal has been shown to be.
This preservation of favourable variations and the rejection of injurious variations, I call Natural Selection.
Species that struggle to adapt to survive will become extinct.
How have all those exquisite adaptations of one part of the organisation to another part, and to the conditions of life, and of one organic being to another being, been perfected?
Such simple instincts as bees making a beehive could be sufficient to overthrow my whole theory.
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