Ernst Haeckel - Art Forms in Nature

From the website http://www.mblwhoilibrary.org/haeckel/wall_charts.html:

Ernst Haeckel was the preeminent proponent of Darwinism in Germany. His watercolors and drawings, made during his sojourn in Ceylon (Travel Pictures) and on his scientific journeys (Art Forms in Nature), are landmarks in the field of naturalist illustration, although many would not pass strict scientific muster. Indeed, much of naturalist illustration is not natural at all but permits stylization and distortion for decorative effect. Haeckel aimed Art Forms in Nature at a broad audience rather than specialists. Each of the 100 plates was accompanied by a short, readable commentary that made biological concepts accessible to the public. Moreover Haeckel's use of Art Nouveau techniques made the book even more appealing and "fashionable." The publication was an immediate success and remains a treasure to this day.