Shakespeare has several references to the old superstitious belief in the transmigration of souls, traces of which may still be found in the reverence paid to the robin, the wren, and other birds. Thus, in “The Merchant of Venice” (iv. 1), Gratiano says to Shylock:
“Thou almost makest me waver in my faith
To hold opinion with Pythagoras
That souls of animals infuse themselves
Into the trunks of men: thy currish spirit
Govern’d a wolf, who, hang’d for human slaughter,
Even from the gallows did his fell soul fleet,
And, whilst thou lay’st in thy unhallow’d dam,
Infused itself in thee; for thy desires
Are wolfish, bloody, starved, and ravenous.”
Caliban, when remonstrating with the drunken Stephano and Trinculo, for delaying at the mouth of the cave of Prospero, instead of taking the magician’s life (“Tempest,” iv. 1), says:
“I will have none on’t: we shall lose our time,
And all be turn’d to barnacles, or to apes.”
In “Hamlet” (iv. 5), in the scene where Ophelia, in her mental aberration, quotes snatches of old ballads, she says: “They say the owl was a baker’s daughter! Lord, we know what we are, but know not what we may be.”[81]
Again, in “Twelfth Night” (iv. 2), there is another reference in the amusing passage where the clown, under the pretence of his being “Sir Topas, the curate,” questions Malvolio, when confined in a dark room, as a presumed lunatic:
“Mal. I am no more mad than you are: make the trial of it in any constant question.
Clo. What is the opinion of Pythagoras concerning wild fowl?
Mal. That the soul of our grandam might haply inhabit a bird.
Clo. What thinkest thou of his opinion?