FOR ALL CLIMATES 



15 



which have been given will serve for purposes of illustration. Dur- 

 ing the twenty-four hours the average human body takes in during 

 the twelve hours of daylight only about 40 per cent of the total 

 amount of oxygen required and gives off about 60 per cent of 

 carbon dioxide. During the twelve hours of night, mainly during 

 sleep, some 60 per cent oxygen is taken in and only about 40 per 

 cent carbon dioxide is given off. From this it will be seen that the 



Interior view of F. M. Peasley's fresh-air house for 2,000 layers, Cheshire, 

 Conn. Show^ arrangement of track for feed car, hoppers, roosts, 

 partitions, etc. (See page 64.) 



body during the day gives up or gets rid of from 20 to 40 per cent 

 more oxygen than it takes in, and during the night it takes in from 

 20 to 40 per cent more than it gives up. It may be urged that 

 the amount of carbon dioxide (poisonous gas) given off at night 

 is considerably less than by day, but bear in mind that the space 

 occupied by a sleeping fowl at night is very much less than the 

 space which it occupies through the day and that at night it remains 

 in one place. Unless the fowl at night is abundantly supplied with 

 pure, fresh breathing air, it has less chance of obtaining the neces- 



