Perkins (1814-1892) authored Snowflakes: a chapter from the book of nature, a collection of poems, extracts, anecdotes and reflections on the theme of snow and the snowflake, from which these illustrations are taken. According to the preface of the book, apart from the first few geometrical figures at the top of the first plate, which show the primary geometrical forms under which the snow-vapor crystalizes, all the other forms shown are “representations of individual crystals, actually observed and sketched with the aid of the microscope”.
https://publicdomainreview.org/collection/illustrations-of-snowflakes-1863
