the lamps and turned the eggs, so we leave the 

 incubator and go about our other business, not 

 expecting to have to attend to the incubator again 

 until 6 or 7 P. M. If the temperature of the room, 

 remains at 55 and the lamp trip does not clog or 

 stick all may go well ; but by n A. M. the tem- 

 perature of the room has risen to 70, the tempera- 

 ture of the egg chamber rises to 103^ and the 

 lamp flame is lowered. The temperature of the 

 room keeps rising until it reaches 80, and not- 

 withstanding the fact that the flame is lowered, the 

 heat in the egg chamber rises to 104^ and the 

 second regulator opens a damper valve in the egg 

 chamber. Now the cooler air of the room (at 80) 

 rushes in the egg chamber, acts on the thermostat 

 and closes the valve. It also acts on the other 

 thermostat and causes the flame to be turned up, 

 while the water in the tank has not cooled a 

 degree. The higher flame now makes the water 

 still hotter, and the air in the egg chamber is 

 reheated, down goes the lamp, open flies the 

 damper, the cooler air rushes in, the damper closes, 

 up goes the flame, and hotter still gets the water 

 in the tank. The up and down and opening and 

 closing process goes on at an increased rate 

 (shorter intervals) while the egg chamber goes 

 through a course of chills and fevers with fluctu- 

 ating ventilation and moisture the latter being 

 affected by every change of ventilation, until the 

 temperature of the room declines towards evening 

 to 55 or 60 or to the point at which it stood 

 when the regulators were set or adjusted. If you 

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