SUCCESS IN POULTRY CULTURE 
trays on top of incubator to turn and cool 
the eggs. Trays should not project over 
edge of incubator while the eggs are cool- 
ing. Change ends with trays each time 
before placing them back in the incubator. 
The door of the incubator should remain 
closed while turning and cooling the eggs. 
Testing should be done 
in a dark room. In test- 
ing the eggs a_ tester 
should be used that will not bring the 
eggs close enough to the source of light 
to heat them. They can be easily ruined 
for hatching by bringing too close to a 
hot lamp while testing. 
The eggs should be tested two or three 
times during the hatch, and all infertile 
ones, and those with dead germs, removed. 
The infertile eggs are those that remain 
clear for six or seven days after sitting. 
With a little practice you will soon be 
able to distinguish those that have dead 
germs from those that have not. Never 
expose the eggs to bright sunshine. 
If the incubation has 
been successful, the chicks 
should commence to hatch 
on the morning of the nineteenth day, and 
122 
Testing Out In- 
fertile Eggs 
At Time of 
Hatching 
