The causes for this transformation of a river which once supplied a large annual revenue to the prosperous communities which lined its banks, into a stream unwholesome and unfit for the proper maturing of its shellfish, have been much discussed. The prevailing opinion seems to lay the blame to the impurities discharged into the river by the Taunton factories. Other theories, ingenious but far less worthy of weight, have been urged; but the burden of evidence strongly points to the sewage of the city of Taunton as the probable main factor in the decline of the industry. While greatly impaired as a favorable territory for the propagation of oysters, the river, however, is still largely utilized. Extensive grants are sold by the towns of Dighton, Berkley and Freetown to oystermen, who bed them with "seed," which is allowed to remain until it is from two to three years old, when it is taken up and replanted in some other locality where the waters are uncontaminated, and here left for a certain time until it becomes "purified" and ready for shipment to market. By this method the old grants are still worked, though greatly declined in value, as oysters can no longer be sold to market direct, and the process of transplanting entails considerable expense. In the other towns of this region the industry is carried on much the same as in Buzzards Bay or Barnstable. A great deal of attention is paid to the enemies of the oyster, particularly the starfish. This animal is combated chiefly with "mops" of cotton waste which are dragged over the bottom, and the starfish, becoming entangled in the strands, are removed and destroyed. As this fairly effectual warfare is being constantly waged, the numbers of this pest are kept well reduced, and the grounds maintained in very good condition. By a peculiar local custom, which would be decidedly unpopular in some coast communities, the towns of this section usually sell their entire oyster privilege to some individual or company, ordinarily the highest bidder. In this manner, aided by the fact that some persons purchasing such rights re-sell them to others, the oyster industry of this entire region is owned and controlled by a very few men. This arrangement, however, does not seem to be unpopular, the only difficulty arising from those clammers who are accustomed to dig clams under water, and sometimes find a bed located on an oysterman's grant. In such cases the owners usually waive their rights, and allow the clammers to dig undisturbed.