The plate from Ehrenberg's "Das unsichbar wirkende organische leben. Eine vorlesung im vereine fur wissenschaftliche vortrage zu Berlin am 12 Februar 1842" (The seemingly invisible organic life). It is very unusual, because it was likely designed to appeal to and educate the general public. The bottom half of the plate shows illustrations of familiar items drawn to the same scale as the remains of microorganisms found in minerals. Shown in the bottom half, from left to right, are a scale from a butterfly wing, silk thread, sable, and grains of potato starch, all above a human eyelash.
