When fate has allowed to any man more than one great gift, accident or necessity seems usually to contrive that one shall encumber and impede the other. It has been thought, rightly or wrongly, that even the work done by such supreme men as Michel Angelo and Leonardo was impaired on this hand or on that by the various and eager impatience of genius which impelled them alternately along diverging lines of life and labour. Be that as it may, there is no room to doubt that such a double natured genius as was theirs lies open to a double kind of attack from the rancorous tribe of weaklings and dullards. The haters of either light or of any may say that there cannot be sunlight and moonlight in the same sky; that a double-gifted nature must be powerless to beget as to bear, sterile by excess of organs as by defect, "like that sweet marble monster of both sexes" beloved of Shelley as of Gautier: that the time and ardour of spirit and of hand spent on this way of work must be so much lost to that other way; that on neither course can the runner of a double race attain the goal, but must needs in both races alike be caught up and resign his torch to a runner with a single aim. Candid envy and judicious ignorance will mutually concede something;