STANDARDS FOR FRUITS AND VEGETABLES 95 
that the wrapper leaves shall be not more than three 
in number, ‘none of which may be excessively large 
and coarse. 
11. ‘ Fairly firm” means that although the head is 
not firm, it is not soft or spongy. 
12. “Serious damage” means any injury which 
causes the loss of a material portion of the edible 
part of the head. The loss of crispness due to freez- 
ing Shall not be considered serious damage. Heads 
affected with tipburn shall be considered as seriously 
damaged when any single spot is larger than one and 
one-half inches in length and/or three-fourths of an 
inch in width. , i 
13. *‘ Fairly uniform in size” means that not more 
than 10 percent, by count, of the heads in any one 
container may be one standard size smaller than the 
standard size head for the count packed. 
Haxample of Standard Size Head.—The standard 
size head for a 4-dozen pack is that size which will 
pack tightly 4 x 4 heads of uniform size in a layer in 
the crate, assuming that the head has the average 
number of wrapper leaves found on all the heads in 
the crate. 
STANDARD PACK 
Heads of lettuce shall be fairly uniform in size 
(13), and tightly packed in uniform layers accord- 
ing to the approved and recognized methods, provided 
that a “ bridge” may be used with sizes smaller than 
5-dozen count. 
In order to allow for variations incident to proper 
packing, not more than a total of 15 percent of the 
containers in any lot may not meet the requirements 
of the standard pack, but no part of this tolerance 
shall be allowed for packs which are excessively 
loose in the layers. 
UNITED STATES STANDARDS FOR MUSTARD 
GREENS 
(Effective Dec. 18, 1928) 
GRADES 
U.S. No. 1 shall consist of mustard greens which 
are fresh, free from decay and from damage caused 
by seed stems, broken, bruised, spotted, or discolored 
leaves, wilting, dirt or other foreign matter, disease, 
insects, or mechanical or other means. 
