The principal type of soil is mud, and the mud flats comprise about 250 acres. The flats of Parker River and those in its immediate neighborhood, however, are largely sand, and altogether they aggregate about 110 acres. Of these, "the thoroughfare" is practically the only one which furnishes clams in any quantity. Sections of the broad flats which border on Plum Island Sound produce scattering clams of large size. There is, however, no very good digging in town, and no consistent effort seems ever to have been made to utilize the great wealth which lies dormant in the clam flat territory. Six Newbury men dig intermittently in the summer, and furnish some 300 bushels, worth about $250, for town trade. However, this does not take into consideration the amount taken from these flats by the Newburyport clammers. SUMMARY OF INDUSTRY. Number of men, 6 Capital invested, $75 Production, 1907:-- Bushels, 300 Value, $250 Total area (acres):-- Sand, 110 Mud, 250 Gravel, - Mussels and eel grass, - Total, 360 Productive area (acres):-- Good clamming, - Scattering clams, 100 Barren area possibly productive (acres), 260 Waste barren area (acres), - Possible normal production, $40,000 _Rowley._ Rowley presents a more striking example of the decline in the shellfish industry than any other town in this region. Four hundred acres of good flats border Plum Island and Rowley River within the town limits, but of these only 20 at most are economically productive. Eighty acres more are not entirely barren, though practically worthless, while the remaining 300, though almost all well adapted for clam culture, are barren.