“Isaac’s humility did not discriminate between man and man and scarcely between man and watch. In his thought men were much like their watches. The passage of time was marked as clearly upon a man’s face as upon that of his watch and the marvelous mechanism of his body could be as cruelly disturbed by evil hazards. The outer case varied, gunmetal or gold, carter’s corduroy or bishop’s broadcloth, but the tick of the pulse was the same, the beating of life that gave such a heartbreaking illusion of eternity.”