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 man who kept the path to the Patent Office hot with his footsteps.'

His capacity for labouring without rest is very remarkable. On one occasion, after improving his Gold and Stock Quotation Printer, an order for the new instruments, to the extent of 30,000 dollars, arrived at the factory. The model had acted well, but the first instruments made after it proved a failure. Edison thereupon retired to the upper floor of the factory with some of his best workmen, and intimated that they must all remain there until the defect was put right. After sixty hours of continuous toil, the fault was remedied, and Edison went to bed, where he slept for thirty-six hours.

Mr. Johnson, one of his assistants, informs us that for ten years he worked on an average eighteen hours a day, and that he has been known to continue an experiment for three months day and night, with the exception of a nap from six o'clock to nine of the morning. In the throes of invention, and under the inspiration of his ideas, he is apt to make no distinction between day and night, until he arrives at a result which he considers to be satisfactory one way or the other. His meals are brought to him in the laboratory, and hastily eaten, although his dwelling is quite near. Long watchfulness and labour seem to heighten the activity of his mind, which under its 'second wind,' so to speak, becomes preternaturally keen and suggestive. He likes best to work at night in the silence and solitude of his laboratory when the noise of the benches or the rumble of the engines is stilled, and all the world about him is asleep.

Fortunately, he can work without stimulants, and, when the strain is over, rest without narcotics; otherwise his exhausted constitution, sound as it is, would probably break down. Still, he appears to be ageing