Three hundred years ago the Dutch microscopist Antoni van Leeuwenhoek died. He had been corresponding with the Royal Society for fifty years. Leeuwenhoek, born in Delft in the Netherlands in 1632, developed himself into one of the most prolific early microscopists. He made his own lenses and small hand-held microscopes which were more versatile than most other devices at the time. With these instruments and his outstanding preparation and observation techniques, he was the first to see and describe red blood cells, bacteria and many other things.
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