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Light and Its Phenomena: Europe

Pure Air. Each adult inhales a gallon of air per minute, and consumes daily 30 oz. of oxygen. For the conversion of this oxygen a certain amount of food is required-say 13 oz. of carbon for a male, and 11 oz. for a female, equivalent to 3 lbs. bread and 21/2 lbs. respectively. The proper allowance of air in barracks is 600 cubic feet per man in Europe, and 1000 in India; for hospitals, 1200 cubic feet per bed in Europe, and 1800 in India. Horses require in England 1600 cubic feet each, or nearly as much as 3 men. Air travels in England in healthy years about 44 miles an hour, and 3½ in unhealthy. The percentage of carbonic acid ranges thus: In country In town.

In hospitals .03 In fogs .04 In crowded lanes .05 In theatres.

The percentage of oxygen varies as follows: