








A-B-D, A-B-D Air Ducts , Laterals 
D Mam Aix Duet, 
C~D Direct Warm-Air Duet 
A,A » Lower Air Exits 
B.B Upper Air Exits 
F-(, Fresh Aiy Ducts 
F Intake 
G Discharge. 


Fic. 4.— SECTION oF CATTLE BARN AT EXPERIMENT STATION, Maptison, 
WIs., SHOWING SYSTEM OF VENTILATION. 

Fic. 5— PLAN oF Cow STABLE AT EXPERIMENT STATION, 
Mapison, Wis., SHOWING LocaATION oF AiR Ducts. 
