We have previously shown that the prolonged hours of labour are incompatible with bodily health and mental vigour, and that the Sabbath is absolutely requisite to enable man to perform his accustomed employment—so it is with regard to the eye. The vision is affected by lengthened intensity of observation on any one particular object. It requires variety and relief, both of which the Creator has abundantly provided. The variegated flowers, the different shades of colour in minerals, the lofty trees and the little plants, the mountainous districts and the level plains, the brilliant and diversified hues that frequently decorate the heavens, all combine to testify that the eye cannot retain its perfection, if it is continually fixed on the same scene. The poor needlewomen, who sit the entire day, and sometimes do not cease from their tedious and spirit-subduing work until the light dawns on the following morning, afford a very striking exemplification of the great and unspeakable advantages of the Sabbath. What would be their sad condition—wretched and deplorable even as it is now—were it not that on the seventh day the eye was relieved of its monotonous and weary application? Alas! many of these pitiable females, even with this gracious opportunity to repair the injury inflicted by almost incessant toil, are often at an early age incapacitated, by defective vision, from pursuing their ill-paid occupations, and are then left destitute of their former scanty pittance to procure even sufficient sustenance to preserve life. Take, also, the men who work in pits and mines—where the glimmering lamp is the only source of light, and where all else around is chaotic darkness—how essential and benignant must be the Sabbath to them! Defective vision would completely prevent such men from pursuing their hazardous employment. Thus we once more prove the temporal advantages of the Sabbath to the labouring population. * * * * *