[96b] and I was always unsettling myself with such questions as these: Do heat and cold, by a sort of fermentation, bring about the organization of animals, as some people say? Is it the blood, or air, or fire by which we think? Or is it none of these, and does the brain furnish the sensations of hearing and sight and smell, and do memory and opinion arise from these, and does knowledge come from memory and opinion in a state of rest? And again I tried to find out
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