Engraving from Micrographia, 1665, by Robert Hooke.

Engraving, magnified view of a piece of kettering, and a sea moss and sponge; Schem. 9. From 'Micrographia: or some physiological descriptions of minute bodies made by magnifying glasses with observations and Inquiries thereupon' by Robert Hooke, Fellow of the Royal Society, 1665.