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In the first place, the natures and temperaments of human bodies are not the same, although they are admittedly composed of the same elements, but some contain more, or perhaps less, of this, others of that. And I say further that even the bodies of males are not all equal or alike either in temperament or in constitution. So it is inevitable that the diseases which arise in them should be different both in intensity and in kind, and that some bodies should be easy to cure and amenable to treatment, while others are completely hopeless, being easily affected and quickly overcome. Therefore, to think that all fevers or consumptions or inflammations of the lungs or madnesses, if of one and the same kind, are alike in all bodies is not what one expects of sound-minded, sensible men who have investigated such matters. No, the same ailment is easy to cure in this person but not in that. Just so, I take it, with wheat; if you cast the same seed into different plots of ground, it will grow in one way in the ground that is level, deep-soiled, well watered, blessed with sunshine and breezes, and thoroughly tilled, yielding a full, rich, abundant harvest, no doubt, but otherwise in a stony farm on a mountain, or in ground with little sun, or in the foothills; to put it generally, in different ways according to the various soils. So too diseases become prolific and luxuriant or less so through the soils which receive them. Omitting this point and leaving it entirely uninvestigated, my father expects all attacks of insanity in all bodies to be alike and their treatment the same.
