It is not easy to be alone or to be industrious at any time on board ship. But it is not till you enter the tropics that exertion of body or mind seems to become impossible. It is then that your limbs almost refuse to move, your eyes to see, and your brains to think. The deck is strewn all day with slumbering forms. No plank, no hen-coop redolent of unpleasant odours, is so hard as to repel sleep. It is seldom that a sail needs setting or taking in. Even the barometer almost refuses to move, and influenced (it is said) only by the tide, sinks and rises almost inappreciably with lazy regularity. Nor is there often any excitement to arouse us. Twice only throughout the voyage is land seen: the rough jagged outline of Madeira, and the Desertas, rising from a smooth sheet of blue and purple water, and standing out against the glowing colours of the setting sun; and a few days later Palma, hiding the Peak of Teneriffe. We hope in vain to see, later on, Trinidad (the southern, not the West Indian, Trinidad) and Tristan da Cunha. There are two months in which the horizon is straight with a straightness abhorred on land by nature, such as even the deserts of Africa do not afford. Can it be that so much of the globe is always to be a dreary waste of waters? Is it all needed to make wind and rain, and to be a purifier of the land? Or when earth is overpeopled, will a new creation spring out of the sea? At any rate, there is change of some kind going on. We are unpleasantly made aware of this by a sudden cessation of wind, with calms, squalls, and foul wind, off the Canaries, in what should be the very heart of the trade-winds—the trades, whose blast used to be as steady and uniform as the course of the sun itself. A great change has occurred, says the captain ruefully, even in his time (and he is not forty,) in their regularity. If they go on at this rate, there may be none at all in a century, and not Maury himself can foresee the consequences of that.