Figure 315 of the 1887 volume Popular Zoology depicting an ai, or three-toed sloth.
Designed to give students an understanding of the animal worlds, Popular Zoology describes and identifies the animals in two kingdoms of nature: the Invertebrates and the Vertebrates. The volume includes copious intaglio printed illustrations of the animals described, as well as a series of charts detailing the systematic arrangement of representative forms. This is one of a series of textbooks written by American educator Joel Dorman Steele (1836-1886), who often worked in collaboration with his wife Esther Baker Steele (1835-1911). Subjects addressed in a similar manner in other volumes include chemistry, human physiology, physics,and astronomy. Popular Zoology was completed posthumously by J. W. P. Jenks (1819-1894), Professor of Agricultural Zoology at Brown University, who is credited as a co-author on the volume.
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Steele, Joel Dorman, and Jenks, J. W. P. (John Whipple Potter). “Figure 315. Ai, or Three-Toed Sloth.” Popular Zoology. New York, New York: Chautauqua Press, 1887. https://digital.sciencehistory.org/works/1d2ng3x.
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