1. What are the characteristics of the skin, and what office does it perform? 41 2. What can you state of the structure of the skin? 41 3. Describe the cuticle and tell its use. 41, 42 4. Describe the cutis or true skin and tell its use. 42 5. What can you state of the nature and growth of the nail? 42, 43 6. Of the nature and growth of the hair? 42, 43, 44 7. Of the offices performed by the nails and hair? 44 8. How is the difference in complexion in different persons accounted for? 44 9. How is the presence of freckles accounted for? 44 10. How does Nature provide a dressing for the hair? 44, 45 11. What other service do the sebaceous glands perform? 45 12. State what you can of the perspiratory glands. 45 13. What is the difference between sensible and insensible perspiration? 46 14. State the uses and importance of perspiration. 46, 47 15. What impurities gather naturally on the skin? 47 16. Repeat what is said of the importance of bathing. 47, 48 17. When should we indulge in cold, warm, and sea bathing? 48, 49 18. What is the effect in each case? 48 19. What directions are given as to the time and manner for bathing? 49 20. What is related of bathing among the ancients? 49, 50 21. What is related to show the antiquity of sun-bathing? 50 22. What are the effects of sun-bathing? 50, 51 23. What directions are given in relation to clothing the body? 51 24. What can you state of poisonous cosmetics? 51, 52 25. Of hair-dyes and eye-washes? 52 * * * * * {53} CHAPTER IV. THE CHEMISTRY OF FOOD. _The Source of Food--Inorganic Substances--Water--Salt--Lime--Iron--Organic Substances--Albumen, Fibrin, and Casein--The Fats or Oils--The Sugars, Starch, and Gum--Stimulating Substances--Necessity of a Regulated Diet._ [Sidenote: 1. The term food? Source of food? Need of preparing food?]