42. Q. For what are disinfectants not a substitute? A. They are not a substitute for cleanliness, and the use of water and fresh air, which are the great purifiers.
43. Q. What is the most important use of disinfectants? A. It is that which destroys the infections and invisible virus of the contagious or infectious diseases.
44. Q. What are the principal disinfecting agents employed? A. Heat and chemical substances.
45. Q. What is it found that boiling heat will destroy? A. Infectious or contagious virus in clothing and infected apartments.
46. Q. What are some of the chemical substances used as disinfectants? A. Sulphate of zinc, carbonate of soda, chloride of lime, and carbolic acid.
47. Q. How is the special drying of a damp apartment best secured? A. By the continual and strong currents of air, blowing through and through.
48. Q. What proportion of the volume is air contained in the grounds upon which we walk, or that are under and about our houses? A. It is found to be nearly one-fifth of the entire volume or quantity of every solid foot or yard of earth.
49. Q. How is this air clean and fresh, or impure and sickening? A. According to the condition of the grounds and the places out of which it comes.
50. Q. Like habits of personal virtue and the right use of our time and thoughts, what will these habits of cleanliness and the sanitary regulation of houses become? A. Sources of personal and domestic happiness and health.
