Page:A Journey to the Western Islands of Scotland - Johnson (1775).djvu/188

 then removed to, where we finished our observations on the island of Sky.

As this Island lies in the fifty-seventh degree, the air cannot be supposed to have much warmth. The long continuance of the sun above the horizon, does indeed sometimes produce great heat in northern latitudes; but this can only happen in sheltered places, where the atmosphere is to a certain degree stagnant, and the same mass of air continues to receive for many hours the rays of the sun, and the vapours of the earth. lies open on the west and north to a vast extent of ocean, and is cooled in the summer by perpetual ventilation, but by the same blasts is kept warm in winter. Their weather is not pleasing. Half the year is deluged with rain. From the autumnal to the vernal equinox, a dry day is hardly known, except when the showers are suspended by a tempest. Under such skies can be expected no great exu-