Exposure to heat and cold, exposure to heat and humidity and to meterological influences of either a stimulating or depressing nature, call for the expenditure of nerve energy in resisting them. They are, therefore, enervating influences. Rarely are they sufficient, alone, to prostrate the vital functions, but when added to the existing enervation, they are frequently sufficient, by their added check upon elimination, to bring on a mild or severe crisis.

The dampness and lack of sunshine that favor fungus growth is unfavorable for the highest expression of human life. It depresses the body's functions, checks elimination, damages the food supply, and lowers resistance to other influences. The sunshine and warmth that cause corn to grow, forms, also, the best medium for growth of the body and its repairs. People "catch" cold as often from an increase as from a decrease in temperature; in dry as often as in wet weather. Over-exposure to sunshine is a common cause of enervation today. Dr. Tilden says: "I do not believe in sun-baths. Some of the worst enervated women that I have had are those who have taken sun-baths until they have a rind equal to a Mexican's-- pronouncedly enervated; a condition that requires a year or two to overcome."

It is not good judgement to reject sunbaths because their over use produces harm. The same logic would reject food, water, rest, exercise, bathing and all the good things of life. But that excessive sunbathing may produce a profound enervation is very true. If the "perpetual sunshine" so glibly talked about by the Chamber's of Commerce of certain cities, were a fact, it would only add one more cause to our already voluminous stock of nerve-destroying influences.