1905.] 



Artificial Incubation. 



95 



Diagram III., shows the percentages of hatchings for tank 

 (A and B) and hot-air (C) machines respectively. It will be 

 seen that in April, May, August, September, October, 1904, 

 February and March, 1905, the tank machines gave the higher 



l<?04 



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1 



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Diagram III. 



Monthly Percentages of Hatchings in Tank and Hot-Air Machines. 



percentages ; and that in June, November, December, 1904, and 

 January, 1905, the hot-air machines were in advance of the others. 

 Taking the entire period of twelve months the percentages for 

 the tank incubators worked out to 78*2 per cent, of fertile eggs 



