it becomes defined, and is hence called not merely science, but the science of medicine. I quite understand, and I think as you do. Would you not say that thirst is one of these essentially relative terms, (439) having clearly a relation— Yes, thirst is relative to drink. And a certain kind of thirst is relative to a certain kind of drink; but thirst taken alone is neither of much nor little, nor of good nor bad, nor of any particular kind of drink, but of drink only? Certainly. Then the soul of
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