Had I even the secret of one such mind⁠—did I hold the key to the fancy of even one lunatic⁠—I might advance my own branch of science to a pitch compared with which Burdon-Sanderson’s physiology or Ferrier’s brain-knowledge would be as nothing. If only there were a sufficient cause! I must not think too much of this, or I may be tempted; a good cause might turn the scale with me, for may not I too be of an exceptional brain, congenitally?