"From my numerous observations, I conclude that these tubercle bacilli occur in all tuberculous disorders, and that they are distinguishable from all other microorganisms."

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He look'd a little disorder'd, when he said this, but I did not apprehend any thing from it at that time, believing as it us'd to be said, that they who do those things never talk of them; or that they who talk of such things never do them.

— Daniel Defoe