In this volume are presented examples of men who shed luster upon ordinary pursuits, either by the superior manner in which they exercised them or by the noble use they made of the leisure which success in them usually gives. Such men are the nobility of republics. The American people were fortunate in having at an early period an ideal man of this kind in Benjamin Franklin, who, at the age of forty-two, just mid-way in his life, deliberately relinquished the most profitable business of its kind in the colonies for the sole purpose of developing electrical science.