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ti.]   QUALITIES.   95

From Saturday afternoons to Monday mornings would walk forty to fifty miles [in pursuit of a branch of natural history]. Could work hard at business all day (and a very anxious business), and at evening and night would work hard at [two branches of science]. Found a wonderful relief in science.

" Father-Energetic in travelling ; great energy in business."

38. "For several years was engaged in full medical practice, and at the same time was a lecturer on . . . and engaged in investigations on . . . . for which the Royal medal was awarded by the Royal Society.

" Father and Mother-Both of active habits."

39. "In professional life I have often been up three successive nights without distress, but did not like a fourth, if it came. Consider that my limit. In mind-Wrote . . . . [a considerable work] between eleven P.M. and two A.M., after professional hours. All the time that I have devoted to science has been stolen from strictly