16 BULLETIN 565, U. S. DEPARTMENT OF AGRICULTURE. 
MIXED ROT. 
(Plate VI.) 
BEFOEE THE CANDLE. 
White: Thin and unevenly streaked 
with yellow. 
Yolk: Broken and partially mixed with 
the white; may contain whitish 
streaks. 
Distinguishing characteristic: 
Partially addled contents. 
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. 
Distinguish ing char act e r i sti 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. 
(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. 
