Engravings from Schem. 15 of the first edition of Robert Hooke's seminal volume, Micrographia : or, Some physiological descriptions of minute bodies made by magnifying glasses. With observations and inquiries thereupon. Depicted here are an assortment of nettles and other venomous plants that are the subject of Hooke's experiments in Observations XXV and XXVII. Figure 1 depicts a nettle plant. Figures 2 and 3 depict a length and cross-section of a beard of wild oat, which traditionally was used in hygrometers as an indicator of moisture in the air. Figure 4 depicts a device for discovering the various constituents of air with use of a beard of wild oat.
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Hooke, Robert. “Microscopic View of Nettles and Other Venomous Plants.” In Micrographia : or, Some Physiological Descriptions of Minute Bodies Made by Magnifying Glasses. With Observations and Inquiries Thereupon. London, England: J. Martyn, 1665. https://digital.sciencehistory.org/works/2b88qd40r.
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