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DR SUTHERLAND SIMPSON ON 



by A" ; two died on May 3rd, and the remaining four were mothered by both A' 

 and A". 



Both B' and B" were laying throughout the whole period at the rate of one egg 



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Fig. 3. — Chart showing temperature curves of hens A' (interrupted line, brooding) at end of first week of 

 incubation, and B' (continuous line, control), April 13th and 14th. 



every second or third day. Although B' was confined in a narrow space it appeared 

 to be a particularly active bird ; when observed during the day it was rarely sitting, but 

 nearly always standing or walking backwards and forwards within the narrow limits of 







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Fig. 4. — Chart showing temperature curves of hens A' (interrupted line, brooding) one week after end of incubation 

 period, and B' (continuous line, control), May 4th and 5th. 



its cage. In this respect its selection as a control was unfortunate, since I was desirous 

 of having a resting but non-incubating hen. 



A further series of observations was made for me in May and June by Mr W. G. 

 K hum, to whom I would take this opportunity of expressing my thanks. Three ' ' broody " 



