26 POULTRY FOR PROFIT 
such a manner that the eggs will become 
chilled, or that too much air will be admitted 
so as to carry off the moisture. Most incu¬ 
bators carry proper directions so as to provide 
against this danger. 
The third condition necessary for proper run¬ 
ning of the incubator is the maintenance of a 
constant temperature. It is usually advisable 
to have the temperature about 102 degrees F. 
the first week, 103 degrees the second week, 
and 104 degrees the third week. Any serious 
deviation from 103 degrees will result in a poor 
hatch. ' 
Now, then we will conclude this chapter with 
a few pointers on running the incubator dur¬ 
ing the hatching period. It is always well to 
run the incubator a day or two empty, so as to 
get the idea of how to best maintain the re¬ 
quired temperature. Clean the lamp thoroughly 
before running, and then during the hatch, al¬ 
ways tend to the lamp after the eggs have 
been turned, and never before, because if the 
hands are smeared with kerosene, some of this 
is bound to be left on the shells, which will re¬ 
sult in a poor hatch. Do not allow the lamp 
