Book page Google Books The Museum of Science and Art (London: Walton and Maberly, 1855), Volume 6, edited by Dionysius Lardner, p.97. The plate is discussed on p.106.
87. In fig. 40, p. 97, we have given the appearance presented by a thin disc, the 120th of an inch in diameter, of common cow's milk magnified 400 times in its linear, and therefore 160000 times in its superficial dimensions, engraved from a daguerreotype by MM. Donne and Foucault.
