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Such As Color Blindness: Certain diseases have particularly serious effects on the prenatal development of the child. By injuring the germ cells before fertilization, or by infecting the fetus before or at birth, the toxins of syphilis frequently cause stillbirth, miscarriage, congenital mental deficiency, blindness, or deafness. Gonorrhea is responsible for much sterility in men and women. In the past it has also been a common cause of blindness in the child. There is a simple preventative for this type of blindness: drops of a solution of silver nitrate are placed in each eye at birth. A small pamphlet
Certain physical traits, such as color blindness, length of fingers, color or eyes, color of hair, curly or straight hair, appear to be determined by heredity. Under ordinary conditions environment does not modify these characteristics. But with a few rare exceptions every characteristic is the product of the interaction of heredity and environment.
However, there are hereditary tendencies—toward long life, toward emotional stability, toward high intelligence.
Q Select the paint color for the background and paint the walls. Next, choose the color for your top coat. If you are working with an oil-based eggshell paint you will need to thin it (3 parts top color to 1 part mineral spirits). Choose a top coat color that is either close in tone or contrasts with your Wall color. With dry-brushing, you can cover the background color completely, so your top coat is the color you will see on your finished walls.
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