There are many things we should _never_ do. Among them are:-- "Never go to bed with cold or damp feet. "Never lean with the back upon anything that is cold. "Never begin a journey until the breakfast has been eaten. "Never take warm drinks and then immediately go out in the cold. "Never ride in an open carriage or near the window of a car for a moment after exercise; it is dangerous to health or even life. "Never omit regular bathing, for unless the skin is in regular condition the cold will close the pores and favor congestion or other diseases. "Never stand still in cold weather, especially after having taken a slight degree of exercise." Perhaps among the following you may find succinctly stated what will be of eminent value:-- "Focus your brain as you would a burning-glass. Butter enough for a slice won't do for a whole loaf. "Keep empty-headed between times. Mental furniture should be very select. Useless lumber in the upper story is worse than a pocketful of oyster shells. Leave your facts on your book shelves, where you can find them when wanted. A walking encyclopedia cannot work for want of room to turn round in his own head. "Don't tax your memory. Make a memorandum, and put it in your pocket. Every unnecessary thought is a waste of effective force. "Don't believe that muscular exercise contracts head work. Brain and muscle are bung-hole and spigot of the same barrel. It is poor economy to keep both running. "Pin your faith to the genius of hard work. It is the safest, most reliable, and most manageable sort of genius. "Amuse yourself. This is the first principle of good hard work. And the second is like unto it. "Don't work too much. It is quantity, not quality, that kills. Therefore, work only in the day-time. Night was made for sleep. And loaf on Sunday. Six days' work earns the right to go a-fishing, or to church, or to any harmless diversion, on the seventh. "Go to work promptly, but slowly. A late, hurried start keeps you out of breath all day trying to catch up. "When you stop work forget it. It spoils brains to simmer after a hard boil. "Feed regularly, largely, and slowly. Lose no meal; approach it respectfully and give it gratefully. No more can be got out of a man than is put into him. "Sleep one-third of your whole life. How I hate the moralist who croaks over time wasted in sleep. Besides, sleep is, on the whole, the most satisfactory mode of existence."