Stoux City Academy of Science and Letters. 51 
VENTILATION IN THE PUBLIC SCHOOLS OF 
SIOUX CITY. 
BY WHIT. H. CLARK. 
The aim of this paper is to set forth in brief a few 
observations on ventilation in the public school build- 
ings of this city. Lack of time and opportunity has ren- 
dered it impossible to more than touch the subject in 
the briefest way. 
An exhaustive investigation of the ventilating sys- 
tems used and the results obtained therefrom would 
necessitate a thorough study of the sizes of inlets and 
outlets for the air in the various rooms, the velocity with 
which the air enters the rooms, the number of pupils 
seated in each room, and the number of cubic feet of air 
supplied to each pupil per minute; this last determina- 
tion depending on the three factors: the number of 
pupils, the sizes of inlets and outlets, and the velocity of 
the incoming air. It would be further necessary to con- 
sider the source of the air supply and the methods of 
furnishing the air to the rooms, as well as the important 
study of the degree and rapidity of the contamination of 
the air through breathing and through exhalations and 
excretions from the bodies of the pupils. It would be 
necessary, further, to consider the effect which the 
weather conditions cause; the difference in the results 
obtained from a ventilating system under the conditions 
of high wind, medium wind, and calm; the influence of 
heat and cold, of humid atmosphere and of dry atmos- 
pheric conditions. And with all this it would still be 
necessary to take into consideration the varying effect of 
these different conditions in school rooms variously situ- 
ated in the same building, the different effects which a 
strong wind has on two rooms situated respectively on 
the windward and the lee sides of a building. Amidst 
