At anytime of the year, add 12 hours to the time of the sun's setting, and from the sum subtract the time of rising, for the length of the day. Subtract the time of setting from 12 hours, and to the re-mainder add the time of rising next morning, for the length of the night. These rules are equally true for apparent time.

2935. - Leap Year - Leap years are those that are exactly divisible by 4, and also by 400, and not by 100. The year 1900 therefore, will not be a leap year.

2936. - Development of the lungs

Much has been said and written upon diet, eating and drinking, but I do not recollect ever noticing a remark in any writer upon breathing, or the manner of breathing. Multitudes, and especially ladies in easy circumstances, contract a vicious and destructive mode of breath, ing. They suppress their breathing, and contract the habit of short, quick breathing, not carrying the breath half way down the chest, and scarcely expanding the lower portions of the chest at all. Lacing the bottom of the chest also greatly increases this evil, and confirms a bad habit of breathing. Children that move about a great deal in the open air, and in no way laced, breathe deep and full to the bottom of the chest, and every part of it. So also with most out-door labourers, and persons who take much exercise in the open air, because the lungs give us the power of action, and the more exercise we take, especially out of doors, the larger the lungs become, and are the less liable to disease. In all occupations that require standing, keep the person straight. If at table, let it be high, raised up nearly to the armpits, so as not to require you to stoop; you will find the employment much easier - not one half so fatiguing; whilst the form of the chest and symmetry of the figure will remain perfect.