3172. Let every cause tending to depress the moral and physical energies be carefully avoided. Let exposure to extremes of heat and cold be avoided.
3173. Let crowding of persons within houses and apartments be avoided.
3174. Let sleeping in low or damp rooms be avoided.
3175. Let fires be kept up during the night in sleeping or adjoining apartments, the night being the period of most danger from attack, especially under exposure to cold or damp.
3176. Let all bedding and clothing be daily exposed during winter and spring to the fire, and in summer to the heat of the sun.