Owing to the danger arising from sewage contamination the State Board of Health, on Dec. 6, 1906, requested the Department of Fisheries and Game to prohibit the digging of clams for market in Boston harbor. The region closed by this law lies to the west of an imaginary line running from Point Shirley through Deer Island to the northeastern end of Peddocks Island; thence in a southwesterly direction to the extreme point of Hough's Neck. This territory includes Winthrop, Chelsea, Charlestown, Everett, Somerville, Cambridge, Boston, East Boston, South Boston, Dorchester, Neponset and Quincy. For convenience all the prescribed territory is treated under the head of "Boston harbor." The action of the State Board of Health in closing Boston harbor was necessitated by a due regard for the public health, as it seemed inexpedient to allow clams dug from this territory and subject to sewage contamination to be marketed for food. Necessary as this act may have been, the closing of 5,000 acres of flats for the production of edible shellfish made valueless an important source of revenue, and threw a large number of clammers out of employment. Some alleviation of these conditions has resulted through the granting of permits to take shellfish for bait from the prescribed waters, thus furnishing a number of men with transient employment. The value of the law, however, is almost completely nullified, for the danger to the public health is actual, and not imaginary. Under present conditions it is well-nigh impossible to make the necessary surveillance so complete as would be necessary to prove that clams "dug for bait" are not used as food. Further, even in the digging and handling of shellfish in polluted waters there is positive danger of transmitting the germs by hands of the digger to his own mouth or to other persons. The nature of the flats permit the division of Boston harbor into three sections: (1) the north shore, (2) the south shore, (3) and the islands. (1) The northern coast of the harbor has extensive mud and sand flats, covered for the most part with eel grass or scattered mussel beds. Much of the surface is a variety of pebbly gravel, while but little of it appears to be good clam ground. The mud flats are mostly covered with a sewage scum which renders them unsuitable for clams. Scattering clams are found throughout the entire region. The immediate vicinity of Snake Island in Winthrop and the cove on Point Shirley furnish fairly good clamming, while clams are found in a greater or less degree upon the extensive flats of Winthrop harbor. The flats of the Mystic River, which are of a tenacious mud rather unwholesome in appearance, in so far as they have not been encroached upon for building purposes, possess scattered patches of very good digging, and furnish transient employment to 20 or more men. The flats in the Charles and Chelsea rivers likewise furnish fair clamming.