234 ENGLISH MEN OF SCIENCE. [CH. Ill.
perience swift and strange associations of ideas ; in dreams, all men commonly exhibit more vivid powers of imagination than are possessed by the greatest artists when awake. Sober, plodding will is quite another quality, and its over-exercise exhausts the more sprightly functions of the mind, as is expressed in the proverb, "too much work makes a dull boy." But no man is likely to achieve very high success in whom the automatic power of the mind, or genius in its special sense, and a sober will, are not well developed and fairly balanced.