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COMMERCIAL POULTRY RAISING 



with cracked shells hatch, providing the cracks were sealed 

 with adhesive plasteriTaut as a rule it does not pay to bother with 

 them. Cracks mean excessive evaporation or ruptured blood- 

 vessels. 



Front view 



Top view 



{California Experiment Station) 



Fig. 164. — Plans for a revolving hatching egg cabinet. 



There is a commonplace that round eggs will hatch pullets 

 and long eggs cockerels. This is a notion and should not be 

 taken seriously. The shape of an egg is influenced entirely by 

 the contour of the oviduct in which it is cast, and has nothing to 

 do with the sex of its embryo. For further proof of this, we ob- 



