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Donné & Foucault
Fig.40 - thin disc of cow's milk. The 120th of an inch in diameter, magnified 400 times in its linear and 160000 times in its superficial dimensions.
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.