?o THE PRACTICAL POULTRY KEEPER. 



now quite discarded in good incubators, as the carbonic gas 

 from the lamp is as injurious to the developing chick as it 

 would be to human beings." This last statement is alto- 

 gether an error ; the lower the form of life the less of pure 

 oxygen is required, and even a baby requires far less than a 

 grown-up person, or a Chinese than a European. Never- 

 theless, at one time we fully shared this opinion to all 

 intents and purposes, and have only been convinced to the 



Fig. 20." Forester" Regulator. 



contrary by a mass of evidence we could not disregard, to 

 the effect that such simple machines have over and over 

 again hatched remarkably well ; genuine testimonials to that 

 effect are innumerable. As they are the cheapest, we feel 

 bound to state this. The one condition appears to be that 

 a large proportion of fresh warm air enters along with the 

 lamp fumes. In the above the most direct fumes pass out, 

 the valve having a small aperture in the centre always free, 

 playing more or less open as well, and being directly over 

 the lamp, and large quantities of fresh air entering also. In 

 another very simple machine of this type, well known as the 

 Wilson- Wilson " Cosy Coop," a portion of the fumes also 

 escape, and the outside air is admitted freely through all the 



