THE SCIENCE OF VENTILATION AND OPEN-AIR TREATMENT

own physiological activities a constant temperdture.As for instruments to measure relative humidity, it is sufficient to say4hat these instruments do not mdicate the conditions they axe designed to measure as accurately as they should.Together with temperat~e and relative humidity, bodily comfort is also dected by air movement, or, reducing the whole matter, we may say that the loss ot heat from the body tb the atmosphere m general and air movementg which remove the saturated and heated air and supply cooler and drier air are the conditions which deet bodily comfort.As early as 1826, Dr. Heberden(1) suggested that observation of the rate of fall of a thermometer, previously heated, would furnish data for the computation of bodily comfort.He heated a thermometer to 100' F. and noted the number of degrees which it fell in 10 minutes as a measure of "sensible cold."The Italian Government has conZerred u on Dr. Leonard.