Some days passed, each day varying little from the other. It was the habit of Darrell if he went late to rest to rise early. He never allowed himself more than five hours sleep. A man greater than Guy Darrell--Sir Walter Raleigh--carved from the solid day no larger a slice for Morpheus. And it was this habit perhaps, yet more than temperance in diet, which preserved to Darrell his remarkable youthfulness of aspect and frame, so that at fifty-two he looked, and really was, younger than many a strong man of thirty-five. For, certain it is, that on entering middle life, he who would keep his brain clear, his step elastic, his muscles from fleshiness, his nerves from tremor,--in a word, retain his youth in spite of the register,--should beware of long slumbers. Nothing ages like laziness. The hours before breakfast Darrell devoted first to exercise, whatever the weather; next to his calm scientific pursuits. At ten o'clock punctually he rode out alone and seldom returned till late in the afternoon. Then he would stroll forth with Lionel into devious woodlands, or lounge with him along the margin of the lake, or lie down on the tedded grass, call the boy's attention to the insect populace which sports out its happy life in the summer months, and treat of the ways and habits of each varying species, with a quaint learning, half humorous, half grave. He was a minute observer and an accomplished naturalist. His range of knowledge was, indeed, amazingly large for a man who has had to pass his best years in a dry and absorbing study: necessarily not so profound in each section as that of a special professor; but if the science was often on the surface, the thoughts he deduced from what he knew were as often original and deep. A maxim of his, which he dropped out one day to Lionel in his careless manner, but pointed diction, may perhaps illustrate his own practice and its results "Never think it enough to have solved the problem started by another mind till you have deduced from it a corollary of your own."