Z STANDARDS FOR INDIVIDUAL EGGS 
The yolk must be well centered, its outline indistinct, 
and it must be free from visible germ development and 
other defects or blemishes. 
The white must be firm and clear. 
SPECIFICATIONS FOR U. S. EXTRA 
The shell must be clean, sound, and normal. 
The air cell must not exceed two-eighths inch in depth 
and must be regular except in the retail grade of U^ S. 
Extra, when the air cell may be slightly tremulous. 
The yolk must be fairly well centered and its outline 
may be moderately defined. It may be slightl}^ mobile 
but must be free from visible germ development and 
practically free from other defects or blemishes. 
The white must be firm and clear. 
SPECIFICATIONS FOR U. S. STANDARD 
The shell must be clean and sound but may be 
slightly abnormal. 
The air cell must not exceed three-eighths inch in 
depth and may show movement not in excess of one- 
half inch. 
The yolk outline may be well defined. The yolk 
may be mobile and may show slightly visible germ 
development and other definite but not serious defects. 
The white must be reasonably firm and be clear. 
SPECIFICATIONS FOR U. S. TRADE 
The shell must be clean and sound but may be 
abnormal. 
The air cell ma}^ be over three-eighths inch in depth, 
may show movement in excess of one-half inch, and 
may be bubbly or free. 
The yolk may be plainly visible. It may be freely 
mobile and cast a dark shadow. It may show clearly 
visible germ development but no blood. It may show 
other serious defects. 
The white may be weak and watery. 
STANDARDS FOR EGGS WITH DIRTY SOUND SHELLS 
Standards are provided for three qualities of dirty, 
sound-shell eggs, namely, U. S. Extra Dirty, U. S. 
Standard Dirty, and U. S. Trade Dirty. The speci- 
fications for dirty-shell eggs of each of these three 
qualities are the same as for the corresponding quality 
of clean-shell eggs except that the shell may be only 
