3. Be REGULAR in all your habits. Ascertain, as nearly as you can, from your own feelings and experience, how many hours of sleep you require.  No general rule can be adopted, on this subject.  Some people need more sleep than others.  The want of sleep, and excessive indulgence in it, alike operate to enervate both body and mind.  Probably every constitution may be safely brought between five and eight hours.  Of this you will judge by making a fair trial.  That period of sleep which renders both body and mind most energetic and vigorous, should be adopted.  But, if possible, take all your sleep in the night.  Fix upon an hour for retiring, and an hour for rising, and then conscientiously keep them.  Let nothing but stern necessity tempt you to vary from them in a single instance; for you may not be able in a week to recover from the effects of a single derangement of your regular habits.  We are the creatures of habit; but if we would control our habits, instead of suffering them to control us, it would be greatly to our advantage.  It is also important that the hours of retiring and rising should be early.  Upon the plan proposed, early retiring will be necessary to early rising, which is a matter of the first importance.  Early rising promotes cheerfulness; invigorates the system; and in many other ways contributes to health.  It also assists devotion.  There is a solemn stillness before the dawn of day, in a winter morning, peculiarly favorable to devotional feelings; and nothing is better calculated to fill the mind with grateful and adoring views of the beneficence of the Creator, than the refreshing sweetness of a summer morn.  Whoever sleeps away this period, loses half the pleasures of existence.  To sally forth and enjoy the calmness and serenity of such a season; to listen to the sweet warbling of the birds; to behold the sparkling dew-drops, and the gayety of the opening flowers, as all nature smiles at the approach of the rising sun; to join the music of creation, in lifting up a song of softest, sweetest melody, in praise of their great Author, is no common luxury.

4. Spend at least two hours every day in active exercise in the open air. This time may be divided into such portions as you find most convenient.  The proper seasons for exercise are, about an hour either before or after a meal.  This you may do without regard to the weather, provided you observe the following precautions, when it is cold, damp, or wet:—­1.  Exert yourself sufficiently to keep moderately warm. 2.  Do not stop on your way, to get chilled. 3.  On returning, change any garment that may be wet or damp, before sitting down.  This course will not only keep up your regular habits, but produce a hardiness of constitution which will greatly increase your usefulness in life.  It is a great mistake to suppose that exposure to a damp, vapory atmosphere is injurious to health.  The danger lies in exposing yourself when the system is