While I was talking to an old man …

“While I was talking to an old man (who leads a sober life, and never drinks brandy or tobacco, and very seldom any wine) my eye fell upon his teeth, which were all coated over; so I asked him when he had last cleaned his mouth? And I got for an answer that he’d never washed his mouth in all his life … I took some of the matter that was lodged between and against his teeth, and mixing it with his own spit, and also with fair water (in which there were no animalcules), I found an unbelievably great company of living animalcules, a-swimming more nimbly than any I had ever seen up to this time.”
               – Antonie van Leeuwenhoek, Letter 39, September 17, 1683

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