NATURAL HISTORY - Weinmann 1742.
Morus alba - Morus nigra. .
Johan Weinmann (1683-1741) was the director of the longest established pharmacy in Regensburg. His "Phytanthoza Iconographia" is a vast work in eight folio volumes with over a thousand engravings representing several thousand plants. The work may be called the first successful botanical book using colour-printed mezzotint, a process which has been invented in the Netherlands by Johann Teyler around 1688. As practised here by B. Seuter and J. E. Ridinger, it was really a combination of etching and mezzotint, which made possible delicate lines and a very fine grain. The addition of handtinting brought about unusual and subtle effects. (Hunt)