steam and sails, but still more closely resembles the ingenious motor-boat of a Belgian engineer who utilized air-currents to recharge the batteries of an electric propeller. In a calm the ship could for a while continue its course with the assistance of the stored-up power, but under the impulse of a good breeze the engines worked under high pressure, besides being aided by a number of sails. Even thus the activity of the internal organism can for a time dispense with the stimulus of well-directed exercise, but manifests the potency of its assistance with a promptness that precludes all reasonable doubt about the connection of cause and effect. Exposure to a blood-chilling atmosphere makes the generation of animal warmth a question of vital importance, and ten minutes of vigorous exercise will raise that warmth from twenty to thirty degrees. Picket-posts on the Manitoba frontier often keep themselves alive by running, instead of walking, up and down, for half-hours or longer. Premier Gladstone's prescription of "a cord of beechwood a week, axe and wedges, in six instalments, before breakfast," will stimulate the appetite in a manner which no drugs can begin to approach.
