16 BULLETIN 565, U. S. DEPARTMENT OF AGRICULTURE, 



MIXED ROT. 



(Plate VI.) 



BEFOEE THE CANDLE. 



Air space: Enlarged ; the lower wall 



may be movable in outline. 

 White: Unevenly streaked with yel- 

 low ; thin. 

 Yolk: Yolk sac broken in one or more 



places and contents flowing into the 



white. Dark areas may be seen in 



the liquid. 

 Distinguishing c h a ra cterist i c: 



Streaked appearance of contents due 



to mixing of white and yolk. 



Inedible. 



Occurrence: A very common form of deterioration during entire year. 



WHITE ROT. 



OUT OF THE SHELL. 



White: Thin and unevenly streaked 



with yellow. 

 Yolk: Broken and partially mixed with 



the white ; may contain whitish 



streaks. 

 Distinguish ing charade r i s t i c: 



Partially addled contents. 



(Plate VII.) 



BEFOEE THE CANDLE. 



Air space: Enlarged; lower wall may 

 be movable. 



White and yolk: Mixed, giving gen- 

 eral yellow color to contents. 



Distinguishing characteristic: More 

 or less uniform mixture of white 

 and yolk. 



OUT OF THE SHELL. 



White and yolk: Mixed together more 

 or less completely. Has usually a 

 stale or a sour odor. 



Distinguishing characteristic: Ad- 

 dled appearance. 



Inedible. 



Occurrence: A very common form of deterioration during entire year. 



EGG WITH BLOOD RING. 



(Plate VIII.) 



BEFORE THE CANDLE. 



Air space: Large or small. 



White: Thin and clear. 



Yolk: A distinct reddish glow on one 

 side of the yolk, in which is seen 

 a blood ring or portion of ring. 



Distinguishing characteristic: Pres- 

 ence of blood in region showing red- 

 dish glow. 



OUT OF THE SHELL. 



White: Thin and clear. 



Yolk: Germinal spot enlarged and sur- 

 rounded by complete or partial blood 

 ring ; yolk flattened and often very 

 weak. 



Distinguishing characteristic: Blood 

 ring on yolk. 



Inedible. 



Occurrence: During warm weather or hatching season. 



