Drawing by Rudolph Wagner; legend translated from the German.¹  Small venous branch a of the webbing of Rana temporaria at 350× magnification and close to the surface of the epidermis, whose cobblestone-like, mostly hexagonal, flattened, and for the most part nucleated cells b,b,b,b go over the vessel. Blood corpuscles are seen in multiple rows partially on the flat side, partially standing on the edge; in the light area between the flow of blood corpuscles and the vessel wall surrounded by several parallel filaments, one can see the round, bright, much slower moving lymph-corpuscles. The whole image was prepared at low illumination.