(1) Fairly uniform in size means that not more than 10 percent, by count, of the heads in any container may vary appreciably in size from the standard size head for the count pack. The standard size head for a 2-doz. pack is that size head, having four wrapper leaves, which will pack tightly but not excessively tightly in 3 rows, with 4 heads of uniform size in each row, in a layer in a standard fiberboard container. Heads having lesser or greater numbers of wrapper leaves which can be packed as specified herein are considered equivalent in size to a standard size head with 4 wrapper leaves.

(2) Excessively tightly packed means that heads are packed so tightly as to cause distortion or crushing of the heads or breaking of the midribs. The packing of 24 heads of 18 size in a standard fiberboard lettuce container would result in an excessively tight pack.

(3) Lettuce packed in standard fiberboard lettuce containers shall have a net weight of not less than 40 lb. and not more than 48 lb. In order to allow for variations incident to proper packing, not more than a total of 10 percent of the containers in any lot may fail to meet the requirements for standard pack.

SOLIDITY CLASSIFICATION -(a) The following terms shall be used in describing the solidity of lettuce: (1) 'Hard' means that the head is compact and solid. This term represents the highest degree of solidity. (2) 'Firm' means that the head is compact, but may yield slightly to moderate pressure. (3) 'Fairly firm' means that although the head is not firm, it is not soft and spongy, and has good head formation, and edible content. (4) 'Soft' means that the head is easily compressed or spongy ."