264 



POULTRY PRODUCTION 



confined in a pint fruit-jar until it was nearly suffocated 

 lived longer than a perfectly fresh mouse did that was put 



Fig. 140 



A poor poultry house; no ventilation. 



into the jar at that point, is not holding true in the hen-house 

 continually. Every bird in'\he flock of fifty or a hundred is 

 compelled to breathe the poisons given off by all the other 



Fig. 141 



Making a good poultry house out of a poor (Fig. 140) one by providing 

 ventilation by means of a cloth-curtain window and a straw loft. 



individuals in the flock unless there is constant and positive 

 displacement of the expired air by fresh air. 



