8. Is waterproof clothing healthful for constant wear?
9. Why are rubbers cold to the feet?
10. Why does the heat seem oppressive when the air is moist?
11. Why is friction of the skin invigorating after a cold bath?
12. Why does the hair of domestic animals become roughened in winter?
13. Why do fowls spread their feathers before they perch for the night?
14. How can an extensive burn produce congestion of the lungs?
15. Why do we perspire so profusely after drinking cold water?
16. How can we best prevent skin diseases, colds, and rheumatism?
17. What causes the difference between the hard hand of a blacksmith and the soft hand of a woman?