50. How is the skin constantly changing? The shape and number of the cells? Value of the cuticle? How is the cuticle formed? Ans. By secretion from the cutis.
51. What is the complexion? Its cause? Why is a scar white? What is the cause of "tanning"? What are freckles? Albinos? Describe the action of the sun on the skin.
52. Why are the hairs and the nails spoken of under the title of the skin? Uses of the hair? Its structure? How can it be examined? What is the hair bulb? What is it called? How does a hair grow? At what rate? When can it be restored, if destroyed? Does hair grow after death?
53. When hair has become gray, can its original color be naturally restored? What is the danger of hair dyes? Are they of any real value? How can the hair stand on end? How do horses move their skin? Is there any feeling in a hair?
54. Illustrate the indestructibility of the hair. What are the uses of the nails? How do the nails grow? What is the mucous membrane?
55. Its composition? The connective tissue? Why so called? What uses does it subserve?
56. What is its character? How does the fat exist in the body? Its uses? State the various uses of membrane in the body. Where is there no fat? Where is there always fat?
57. Why are the teeth spoken of in connection with the mucous membrane? Name and describe the four kinds of teeth. What are the milk teeth? Describe them. What teeth appear first?
58. Give the order and age at which they appear. When do the permanent teeth appear? Describe their growth. Which one comes first? Last?
59. Describe the structure of the teeth. How are the teeth fitted in the jaw?