Shown here are details from plate 2 of 5 plates for Physique, from Recueil de planches, sur les sciences sciences, les arts libéraux, et les arts méchaniques avec leur explication, 5e volume, 248 planches (Paris: Chez Briasson, David, Le Breton, 1767), from our full set of the Encyclopédie. The plate was drawn by Goussier, engraved by Benard.
According to the description on p. 15 of the same volume,
the illustrations representing the "different shapes of pieces of snow" were derived from an illustration in volume 6 of the Miscellanea berolinensia, the publication of the Berlin Academy of Sciences.
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Illustrations of snowflakes also remind us of an exhibit entitled "Stormy Weather" several years ago in Special Collections. A checklist of that exhibit, curated by Sarah Boxhorn (Potratz), is available.
From that exhibit, we highlight here Cloud crystals: A snow flake album, "edited by a lady" (1865) -- part of our Cairns Collection of American Women Writers.