So, naturalists observe, a flea Has smaller fleas that on him prey; And these have smaller still to bite em; And so proceed ad infinitum.1
Poetry, a Rhapsody.
Note 1. Great fleas have little fleas upon their backs to bite em, And little fleas have lesser fleas, and so ad infinitum. And the great fleas themselves, in turn, have greater fleas to go on; While these again have greater still, and greater still, and so on. De Morgan: A Budget of Paradoxes, p. 377. [back]