402 



40 4S 50 55 id «J 10 75 60 85 90 95 IM IPS IIP 'F 



Pig. 23. Velocity curves for the incubation of eggs under approximately 

 constant temperatures, plotted values being obtained by dividing the mean 

 number of days into 161. These are drawn above the humidity shown at the 

 left for the beginning of each curve. 



Fig. .24. See explanatory note on opposite page. 



