70 THE HOME POULTRY BOOK 
a dead germ will be known because it is not clear like 
an infertile one, and yet has no blood lines when 
the seventh day test is made. These eggs should 
be removed and thrown away. The clear eggs may 
be saved and boiled hard for the newly hatched 
chicks. If a considerable number of eggs are tested 
out, eggs from under hens set at the time the ma- 
chine was started, may be substituted. It is always 
well to test the eggs under sitting hens in the same 
way. Then, if the fertile eggs are not desired to 
replenish a machine, it may be possible to give the 
eggs from two hens to one, so releasing one hen. 
A workable tester may be made at home with the 
aid of a breakfast food box. The top should be 
removed and the sides cut away so that the end may 
be made to closely cover the face, shutting out all 
light. Thena hole slightly smaller than an egg may 
be made at the opposite end. If this little device 
is held toward a strong light and an egg placed 
closely against the opening, the testing can be done 
very quickly and easily. 
Another way of testing eggs where there are a 
considerable number is recommended. A_ light 
board is fitted over a window facing the south and 
a hole made in the board. Then, when the sun is 
