Antique chromolithograph butterfly plate from Macrolepidoptera of the World, Volume 5, Dr. Adelbert Seitz, Editor. Athyrtis - Mechanitis - Plate 33 It is shown in the

It is shown in the field photo

but a decent example if you are explaining the sequence from peat to lignite

It is also used as a filler in rubber and in paper

The color of the gypsum crystals depends on the color of the sand in that dry lake

across the continent from the Appalachians

Antique chromolithograph butterfly plate from Macrolepidoptera of the World, Volume 5, Dr. Adelbert Seitz, Editor. Athyrtis - Mechanitis - Plate 33 It is shown in theThe Seitz plates are spectacular examples of scientific illustration and printing from the early 1900s. The use of metallic inks is unusual and makes some plates particularly dynamic. These were printed over a period from 1907 to 1954, with interruptions by two World Wars. All of these plates will mat and frame handsomely. They measure 9 3 4 " x 13" with a roughly 1 1 4" margin outside the black frame line. They are on a cream paper that is only very