The shellers, generally speaking, would be little affected, since, with their house boats, they could move from one portion of the river to another. Those shellers who do not use house boats, but are local residents and go out only by day from their homes, would be most affected, and it is these generally who are most in favor of closing portions of a river. They recall how much more easily shells were taken in past times when the shells were abundant, and they would be willing to do something else meantime in order that the beds may be given a rest and the shells again become numerous. Shelling has no attraction over any other form of crude labor when the shells are so scarce that a wage can scarcely be made. Taking the St. Francis River in Arkansas as another illustration, the river might be broken at Madison, Parkin, and Marked Tree. It is true that there are not many mussels, according to report, above Marked Tree, but the region between Madison and Parkin has beds which may well balance the remainder of the river. The Wabash River, Ind., is one in which the need for protection is most evident; and this stream could be divided at Vincennes and two other points selected with reference to their economic interest in shelling and with regard to an equitable division of the river system. It might seem that an ideal method of rotation would be based upon the division of a system into six portions, only one of which should be worked in any one year; a new portion would be opened each year, while each territory would enjoy a rest period of five years between successive "open" years for that particular territory. It will be evident that such a scheme, however correct in theory, would be entirely impracticable. The plan of keeping certain regions closed for periods of years while other regions are worked continuously during a corresponding period of years may have some imperfections, but it is probably the best that can be worked out without practically suspending the industry. Undoubtedly the plan will work most efficiently if a proper discretion is used in its application. PROCEDURE FOR ESTABLISHING CLOSED REGIONS. The law should plainly stipulate and establish the principle of the closure of the rivers by regions or sections, but the determination of which specific sections are to be closed should be left for determination after investigation by properly qualified authorities.