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Over-exposure to the hot sun can cause burns, as almost everyone has found out. Less known is the fact that continued over-exposure over a period of years can cause the skin to look weatherbeaten, wrinkled, leather)' and coarse in texture.
The time of day of exposure is important. The burning ultraviolet rays are most intense from ! 1 a m. to 2 p.m. No sunburn is likely before 8 a m. and after 4 p.m. High noon is the hottest time of day for sunburn. Rays reflected from sand or water can burn, even though you may not be directly exposed.
Individual sensitivities differ. You must to some extent learn for yourself how much sun you can tolerate. A general guide for most persons, assuming that previously untanned white skin is exposed about noon, is:
First day, expose skin to sun for 15 to 20 minutes. This means 15 to 20 minutes each on face and back.
Second day, increase exoosure bv one-third, to a little
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