BRITISH LIBRARY / SCIENCE PHOTO LIBRARY BRITISH LIBRARY / SCIENCE PHOTO LIBRARY
Microscopic flea anatomy. English natural philosopher Robert Hooke (1635-1703). Fleas are wingless insects that are a vector for various diseases. The first practical microscopes were developed in the 17th-century. Hooke published detailed drawings of observations made with his microscopes in 'Micrographia' (1665).
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