ordinarily be taken for bad eggs, if dead ; if alive, 

 they would be taken for eggs previously started. 

 But if the germs had died at any time between the 

 thirty-sixth hour and the tenth day, an inexperi- 

 enced person would probably call them fertile 

 eggs and let them go, then wonder why they did 

 not hatch. This happens more frequently than is 

 generally believed. Such eggs are easily avoided 

 by using the tester before setting the eggs. 



Chilled, limed, scalded and cold storage eggs 

 sometimes find their way into the incubator ; but 

 persons should not allow themselves to be fooled 

 so badly. 



While the majority of persons who have good 

 incubators make good hatches, there are some 

 who would make decidedly better ones if they 

 would just post up a little on a few important points 

 which are easily learned by practice of simple and 

 inexpensive experiments. 



Few persons understand testing eggs properly. 

 Some have a very imperfect tester ; some are 

 unable to detect the fertile eggs closely they can- 

 not distinguish a dead germ from a live one, nor a 

 weak from a strong one. 



All eggs should be tested on the fifth or sixth 

 day ; at this test all clear or unfertile eggs should 

 be removed. 



To become expert in testing eggs during incuba- 

 tion, it is necessary to have a good tester. 



By the use of a good egg-tester and the engrav- 

 ings shown here, any person can, with a little 

 practice learn to test eggs rapidly and accurately ; 

 39 



