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A Dutch lens grinder invents the microscope.
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Published An Anatomical Study of the Motion of the Heart and the Blood in Animals.
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Administered medications intravenously by means of an animal bladder attached to a sharpened quill. Wren also experimented with animal blood transfusions.
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Refines the microscope and fashions nearly 500 models. He then discovers blood cells, and observes animal and plant tissues and microorganisms.
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A Scottish naval surgeon, discovers that cirtus fruit can prevent scurvy. He publishes A Treatise of the Scurvy in 1754, identifying the cure for this common and dangerous disease of sailors.
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Created a vaccination for smallpox by making the body immune to the cowpox virus.
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Discovers the antesthetic properties of nitrous oxide, even though it would not be used for 45 years after the discovery in a dentists office.
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He invented the stethoscope.
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British obstetrician is the first to perfom a successful human blood transfusion.
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An Anerican surgeon uses ether as an general antesthetic during surgery.
