On This Day 17 September

By TheBoldAge. Published 2020-09-17
In 1745 Charles Edward Stuart occupied Edinburgh based at Holyrood Palace; in 1900 the Commonwealth of Australia was proclaimed; in 1939 the Soviet Union invaded Poland; in 1954 William Goldin's Lord of the Flies was published. In 1683 Anton van Leeuwenhoek observed "animalcules"

animalculum is the latin for "tiny animal" from which the English animalcules is derived

On the 17th of September, 1683, Anton van Leeuwenhoek described his experiments which were the first to look at microbes and determine their size with his microscope.


His observations were met with some skepticism by the Royal Society, however they were eventually fully acknowledged. He created hundreds of lenses and microscopes of varying sizes - only 9 of which remain. They could magnify up to 275 times. The image below is a magnification of 10,000 times showing e-coli bacteria.


Other events on this day

  • 1683: Anton van Leeuwenhoek observed "animalcules"; the first known description of bacteria
  • 1745: Edinburgh was occupied under Charles Edward Stuart; setting up in Holryood Palace
  • 1900: Commonwealth of Australia proclaimed
  • 1939: Soviet invasion of Poland began
  • 1954: Lord of the Flies by William Golding is published
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