Berlin: Verlag Ernst Wasmuth, 1934. First Edition. Quarto. Portfolio with 100 loose plates. Not to be confused with the common trade edition of the book, which, without its rare dust jacket, can look identical to this portfolio in a photograph. (Similar in format and conception to the portfolio of Blossfeldt's "Urformen der Kunst".) Micro images of the natural world. Booklet laid in. Prochnow, one of the founding members of the New Objectivity movement, was the first major photographer to publish micro photographs. Booklet foxed, a few plates lightly foxed; very good in drop back blue portfolio.