22. Q. In what substances will some kinds of contagion long remain? A. Porous substances, like the clothing or bedding used by the sick, or in the carpets and cloths, and even in the floors and wall-paper, or unwashed walls of the sick-room.
23. Q. Of what are the contagious disorders of the skin, the eyes and mouth the results? A. Of neglect of cleanliness.
24. Q. What is doubtful in regard to persons who become filthy in their habits, and neglect to provide for the purification of their bodies, clothing and premises? A. It is doubtful if they will ever be found pure and sweet in their thoughts, language and influence.
25. Q. Mention some of the things that in their respective ways and times require the faithful application of sanitary rules. A. The air, the water, the streets and grounds, the clothing and dwellings of individuals, and waste and decaying matters.
26. Q. What should be prevented from defiling the air in any region where it is to be breathed? A. Foul vapors and gases, and smoke and sickening odors.
27. Q. What is said as to the water used for drinking and in households? A. The wells, springs, cisterns, and reservoirs of water used for drinking and in households must always be protected against defilement.
28. Q. Name some articles of food that quickly become unwholesome if in the presence of decaying matter and putrid gases. A. Meats, and especially fish, milk and butter.
29. Q. When are the pathways and grounds about dwellings, and all roadways, best kept clean and free from nuisance? A. When so graded and sloped as to give easy surface drainage for the water.
30. Q. How are the freshness and healthfulness of paths and grounds improved? A. By an occasional layer of fine gravel; but never by sawdust, chips, or planks.
31. Q. What is the best of sanitary rules for all undergarments? A. The modern practice of boiling as well as washing.