. Science . ° to keep the sur-rounding temperature from rising. Anordinary gas burner produces 300 B. T. candle-power hour; therefore each suchburner requires 1,500 cubic feet of air percandle power. These calculations, ofcourse, ignore direct heat loss through walls and ceiling which with a zero temperatureoutside may carry off the heat produced by50 or 100 people. Ventilation provisionsmust, however, be based on the least, ratherthan on the most, favorable conditions. Incrowded auditoria every bit of the 2,000cubic feet of air is needed, and in manyindustrial processes where the heat p
. Science . ° to keep the sur-rounding temperature from rising. Anordinary gas burner produces 300 B. T. candle-power hour; therefore each suchburner requires 1,500 cubic feet of air percandle power. These calculations, ofcourse, ignore direct heat loss through walls and ceiling which with a zero temperatureoutside may carry off the heat produced by50 or 100 people. Ventilation provisionsmust, however, be based on the least, ratherthan on the most, favorable conditions. Incrowded auditoria every bit of the 2,000cubic feet of air is needed, and in manyindustrial processes where the heat pro-duced by human beings and illuminants isreinforced by the friction of machinery andthe heat from solder pots, furnaces, man-gles, pressing irons and a host of othersources, even more will be required. Furthermore, the recent studies of theNew York State Commission suggest thatthere may, after all, be certain deleteriouseffects resulting from the chemical composi-tion of the stagnant air of occupied rooms,. STAeHAMT AIR STACflAMr Fig. 7. Average Calorific Value of luncheonseaten witli ample supply of fresh air and with nofresh air supply. In .both summer and fall ex-periments the same conditions as to temperatureand humidity prevailed through each series. Ajeil 30, 1915] SCIENCE 631 entirely aside from its temperature. Asnoted above, all the ordinary physiologicaland psychological tests failed to show anysuch effect; but in one particular we noteda difference in the behavior of the subjectsexposed to stagnant and fresh air of thesame temperature and humidity. In twoof our series of experiments standardluncheons were served to the subjects in theexperimental chamber and the amount ontheir plates was weighed. In one seriesthe subjects consumed on the stagnant daysan average of 1,151 calories and on thefresh-air days an average of 1,308 calories,an increase of 13 per cent. In a secondseries during colder weather, the averageconsumption was larger, 1,492 calories forthe stagnant
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