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190 But man, slow to take nature's constant hint of assistance; makes slight and irregular use of this power, in careening ships and getting them afloat when aground.

This power may be applied in various ways. A large body, of the heaviest materials that will float, may first be raised by it, and being attached to the end of a balance reaching from the land, or from a stationary support, fastened to the bottom, when the tide falls, the whole weight will be brought to bear upon the end of the balance. Also, when the tide rises, it may be made to exert a nearly equal force in the opposite direction. It can be employed wherever a point d'appui can be obtained.

Verily, the land would wear a busy aspect at the spring and neap tide, and these island ships, these terræ infirmæ, which realize the fables of antiquity, affect our imagination. We have often thought that the fittest locality for a human dwelling was on the edge of the land, that there the constant lesson and impression of the sea might sink deep into the life and character of the landsman, and perhaps impart a marine tint to his imagination. It is a noble word, that mariner,—one who is conversant with the sea. There should be more of what it signifies in each of us. It is a worthy country to belong to,—we look to see him not disgrace it. Perhaps we should be equally mariners and terreners, and even our Green Mountains need some of that sea-green to be mixed with them.

The computation of the power of the Waves is less satisfactory. While only the average power of the wind, and the average height of the tide, were taken before, now the extreme height of the waves is used, for they are made to rise ten feet above the level of the sea,