The soluble solids content of the edible portion of the honeyball and honeydew melons shall be determined by extracting the juice from two plugs of the flesh, one from each of opposite sides of the melons, and taken at approximately one-half the distance between the stem and blossom ends. The plugs shall be approximately one-half of an inch in diameter. That portion of the plug three-eighths of an inch from the outside edge of the rind shall not be included as the edible portion of the plug of flesh.