In many kinds of illness, especially continued fevers, and other attacks attended by great debility, good nursing is well known to be as important as good doctoring. A careful physician will direct not only the medicines of the patient, but also his food, and all other matters concerning him - as his covering, changes of clothing, air in his room, etc. But the carrying out of such directions must be left to those immediately in charge of the sick person from hour to hour; and questions will occur in the doctor's absence, sometimes of much importance, which those who nurse the patient must answer and act upon at the moment, from their own knowledge. Moreover, the manner of doing things in the care of a sick person makes an immense difference in his comfort. In critical cases it may even decide between recovery and death.