The warmer and stiller the external air is, the more difficult it becomes to secure free ventilation through the inside of rooms. In the calm hot nights of summer, the windows of sleeping rooms should on this account be left partly open all night long. It is better to breathe air moistened with night dew than it is to breathe air laden with poison vapors. But if it be important when people are well that they shall have an abundance of fresh air moving through their dwellings, it is of far greater consequence that there shall be a thorough ventilation kept up in rooms where there is sickness. In all kinds of fevers the blood is overloaded with poison vapors, and these can not get out of the body unless they are blown away by pure air. The sick person can not be freed from the poison vapors that are clogging up his vital organs until fresh air is supplied abundantly. Do you remember what it was that first made you better, when you had the fever last year? Can you not recall to mind how all the doors and windows of your room were kept constantly open, and how angry I was whenever I came to your chamber and found them fast closed! Have you forgotten how delicious the fresh air felt to your parched and poisoned frame, and what luxury there was in the clean linen when supplied to your body and to the bed, and in the cold water when it was sponged over your skin? If ever you are called upon to attend a neighbor or a relation who has to suffer from infectious fever, as you then did, be sure you furnish to that sick person the same comfort and alleviation which were provided for yourself. Let this be your plan for nursing the sick: Open wide the doors and windows of your chamber. Keep the body of the patient and the room very clean. Change the linen both of the person and the bed very often. Allow only the very simplest kinds of food and drink to be given, and that in small quantities at a time. Prevent all noise and confusion around the bed. There are very few persons indeed who will not recover speedily from attacks of even the worst kinds of fever, if this simple and prudent plan of treatment is steadily pursued.