Frank J. Wilstach, comp. A Dictionary of Similes. 1916.
Brain
Brainless as chimpanzees.
—Charles Stuart Calverley
Great brains, like brightest glass, crack straight; those of stone or wood hold out, and fear not blows.
—Bishop John Earle
I suspect that there is in an Englishman’s brain a valve that can be closed at pleasure, as an engineer shuts off steam.
—Ralph Waldo Emerson
My brain, methinks, is like an hour-glass,
Wherein th’ imaginations run to sands,
Filling up time; but there are turn’d and turn’d
So that I know not what to say upon,
And less to put in act.
—Ben Jonson
Brain like liquid lead.
—Robert Southey