started, but nothing more, there is no heart, nor 

 any part of a chick started. This egg 1 will not 

 hatch, but will decay if left in the hatcher. G, 

 shows a small dark spot, a weak germ, without 

 blood vessels, only partially fertilized ; it has died, 

 after a start, and, of course, will not hatch. Both 

 H and G, may sometimes be seen in the same egg. 

 It will not hatch. F, the air bulb, may be seen in 

 the same egg. The egg may be comparatively 

 fresh, and yet show both G and H. See the follow- 

 ing notes which explain why such eggs are found. 



Fig. 3, shows a stale egg, a clouded egg, a 

 doubtful egg. A stale egg is generally distin- 

 guished by the air space E, being very large on the 

 fifth or sixth day, as shown in Fig. 3, though all 

 stale eggs do not show a very large air space ; but 

 when an egg does show it, it is very good proot 

 the egg is stale. When an egg shows a clouded, 

 muddled appearance as indicated by D (which gen- 

 erally moves about when the egg is turned before 

 the tester), it is certainly stale, and will not hatch. 

 Do not confound the fresh egg which is not fertile 

 with the stale egg ; in an unfertile fresh egg you 

 can see the yelk, which will look somewhat darker 

 than the rest of the egg, but does not look mud- 

 dled. 



Fig. 4, shows a live egg on the sixteenth day. 

 K, is the space occupied by the chick ; the lines 

 I and J, show the air bulb, which may be on top 

 or at the side, as indicated by the respective lines. 

 This is about the average air space on the six- 

 teenth day, but it will vary according to the thick- 

 44 



