Illustrations showing microscopic views of: the surface of a nettle plant (Fig. 1); the beard of a wild oat, in two parts (Fig. 2); a transverse section of the beard of a wild oat (Fig. 3); a hygrometer using the beard of a wild oat (Fig. 4). Schem. XV 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 nettle and wild oat appears in: