Abstract
“Nature, in the production of diseases, is uniform and consistent; so much so, that for the same disease in different persons the symptoms are for the most part the same; and the self-same phenomena that you could observe in the sickness of a Socrates you would observe in the sickness of a simpleton. Just so the universal characters of a plant are extending to every individual of the species; and whoever (I speak in the way of illustration) should accurately describe the colour, the taste, the smell, the figure, etc. of the single violet would find that his description held good, there or thereabout, for all the violets of that particular species upon the face of the earth.”

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