3 



same. On the other hand, should there be a considerable variation in 

 mortality with brooding - , feeding-, etc., alike, we must then come to the 

 conclusion that the method of incubating influences the chick's vitality. 



The incubators used were divided into three groups in order that we 

 might set a number of machines each week throughout the natural hatcn- 

 ing season. Later in the season these groups were somewhat broken up. 



In many instances hens were set upon eggs laid by the same indi- 

 viduals as those used in the machines. We tried to have a number of 

 hens to set at the same time we set the incubators, but owing to a short- 

 age of "cluckers" we were not always able to do so. We give a table 

 which shows the results as obtained from each method of incubating and 

 brooding. 



Fig. 1. — The Experimental Incubator Room. 



Incubators Used in These Experiments. 



Chatham Incubator. Manufactured by the Chatham Incubator Co., 

 Chatham, Ont. This machine is classed under the radiant type of machine, 

 and can be operated with or without moisture. There are moisture pans 

 sent out with each machine. 



Peerless Incubator. Manufactured by the Lee-Hodgins Co., 

 Pembroke, Ont. This is a hot water machine and, according to the 

 manufacturer's directions is to be operated without moisture. 



