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wonderfully lightened for him, while he is acquiring the knowledge he will be very glad of in the busy years that are coining. The microscope is of all philosophical instruments the most unfailing and untiring companion. The astronomer tells us that hardly more than a dozen nights in the year are adapted to his observations. He must watch all night, exposed to cold and damp, surrounded by costly and cumbrous machinery. The microscopist sits down at his fireside or his window, with a littledoi:10.1056/nejm185305250481705 fatcat:gpsczb7klfb6rjseybxewcn4pq