Illustrations showing microscopic views of the pores in charcoal (Fig. 1) and petrified wood (Fig. 2). Schem. X 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 views of charcoal appears in: