Brain

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Letter 8 [4] of 1 June 1674 (cow, method of examining)

Letter 13 [8] (of 4 December 1674 ( method of examining)

Letter 15 [9] of 22 January 1675 (cow);

Letter 32 [20] of 14 May 1677 (cod, cow, duck, fish, cortex, medulla, pia mater);

Letter 81 [42] of 25 July 1684 (cow, sheep, sparrow, turkey, blood circulation, blood vessels, cortex, marrow, nerve fibres, tissue (comparison size);

Letter 88 [47] of 12 October 1685 (horse);

Letter 129 [77] of 20 December 1693 (louse);

Letter 137 [83] of 30 April 1694 (ant);

Letter 193 [111] of 9 May 1698 (ant, drone fly, gnat);

Letter 236 [146] of 20 April 1702 (silk moth);

Letter 339 [XXXIV] of 6 March 1717 (pig)

Note that L. regularly confused insects' tracheae with their blood vessels, especially in the brain.

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Related letters:

What Leeuwenhoek wrote ...
Wrote Letter L-011 of 1674-06-01 to Henry Oldenburg about movement of liquid in capillary tubes, structure of body parts, growth of skin, and the size of red blood cells
Wrote Letter L-021 of 1675-01-22 to Henry Oldenburg about a new technique for observing blood and sectioned brain tissue; optic nerve, smoke, gunpowder, and scorpions
Wrote Letter L-056 of 1677-05-14 to Henry Oldenburg about muscles, blood, the movement of fluids in fruit, moxa, and cotton
Wrote Letter L-150 of 1684-07-25 to Members of the Royal Society about parts of the brain of several animals, chalk stones of gout, leprosy, and the scales of eels
Wrote Letter L-166 of 1685-10-12 to members of the Royal Society about the beginning of plants in seeds; chyle, sweat, about skin, optic nerve, and bile of fish; salts in beer vinegar and lemon juice; and spirits mixed with blood and wine vinegar
Wrote Letter L-231 of 1693-12-20 to the members of the Royal Society about spiders, lice, and mites
Wrote Letter L-242 of 1694-04-30 to the members of the Royal Society about his criticisms of Buonanni's theory of spontaneous generation, about mussels, barnacles, shrimp larvae, the eye of a dragon-fly, gnat, fly, and ant, and about ant eggs
Wrote Letter L-343 of 1698-05-09 to the members of the Royal Society about the compound eye of a beetle and the number of facets, the human cornea, drone flies, and gnat brains and leg muscles
Wrote Letter L-403 of 1702-04-20 to Karl von Hessen-Kassel as a cover letter for Letter L-404
Wrote Letter L-549 of 1717-03-06 to the members of the Royal Society about pig brains, apples, and coconuts; blood circulation nourishes; new technique to examine brains; tea and coffee keep the blood thin

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Leeuwenhoek's science

Life in Holland

in the 1600's

Work in Holland

in the 1600's

Brain

Life in Holland

in the 1600's