Robert Hooke showed the Royal Society microscopical observations of tendons and little animals in anise and coffee

March 17, 1678

At three weekly meetings in early 1678, Hooke showed the Royal Society experiments to confirm some of Leeuwenhoek's observations in his recent letters.


Birch, History, vol. III, p. 391, 7 March 1677/8 (O.S.) in London:

Mr. HOOKE attempted to shew a microscopical experiment of the exceeding smallness of the parts of the tendon of a muscle, viz. that it was not above a twentieth part of the bigness of a hair in diameter; and consequentIy that a hair was four hundred times bigger than one of these. But upon making trial thereof, the tendon was grown so dry, that those minute parts could not be discovered, tho' the same were plainly visible in the morning. It was desired therefore, that the apparatus should be provided against the next meeting; and that the tendon should be provided fresh and fit for this experiment.

Mr. HOOKE then shewed several sorts of animals, produced in the steeping of anniseeds, coffee, &c. in water. These were much smaller than those of pepper, and had a quite contrary motion.