PLATE III. 



Fig. 1. — Unscreened Basement Ventilator. 

 Rats enter basements from the street through such openings They 

 should be covered with wire-mesh screen. (From Public Health 

 Reports, April 11, 1913.) 



Fig. 2. — Rat Screens. 



Properly screened basement ventilators under show windows. 



(From Public Health Reports, April II, 1913.) 



