These beautifully illustrated plates, published in 1863 catalogue the geometrical forms of snowflakes.
The forms of the snow-crystals were observed and sketched over a century prior to this publication. The Transactions of the Royal Society of London, for 1755, contain representations of ninety one varieties with descriptions by the 18th-century Dutch physician John Nettis
The early-19th-century eminent Arctic explorer William Scoresby, has given in his Arctic Regions, drawings for ninety six varieties.
Published by The American Tract Society, Boston 1863
For more information, visit the full article by Rebecca Onion at Slate.com