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Colored chemical tests for arsenic in a nineteen-century chemistry textbook. From Jean-Louis Lassaigne. 1844. Tratado completo de química … Madrid.
by Jose Ramon Bertomeu Sànchez
Figure 1. McGowan, Brian. “Beautiful black horse standing near the Town Square park on Main Street, U.S.A.” August 18, 2020.<br />
https://unsplash.com/photos/G3-g5VzFsvI
by Liam R. Findlay
Figure 1. An illustration of a 'Smell Organ' imagined in a 1922 issue of Science and Invention Magazine.
by William Tullett