Illustrations showing microscopic views of: sparks struck from steel with a flint (Fig. 1); several sorts of hair (Fig. 2), namely a pig's bristle (A), a cat's whisker (B), horse hair (C and D), human hair (E); the hair of an Indian deer (Fig. 3), the thicker part (F) and thinner end (G); a microscopic shell found in sand (Fig. X). Schem. V from Micrographia: or some physiological descriptions of minute bodies made by magnifying glasses with observations and Inquiries thereupon, by Robert Hooke (London, 1665).
Original: copperplate engraving. 1665
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Microscopic view of hair and a shell appears in: