"The Flea" from Robert Hooke's, Micrographia (1665)

<p>An etching titled &quot;The Flea&quot; in Robert Hooke&#39;s book, <em>Micrographia </em>(1665). This illustration became an iconic image in the study of microscopy and led to the nickname &quot;flea glass&quot; for the early forms of the simple microscope.&nbsp;</p>