Nineteenth.--You say the sluices which admit water to wheels or factories shall be kept closed from six o'clock on Saturday night to six o'clock on Monday morning. How, then, are the repairs of shafting and machinery to be made? These are generally done when the workpeople have gone home on Saturdays. Besides, what is your object? If the river is low, the Salmon will not be running up the stream, and if it be in flood there will always be an abundant supply running over the weir in addition to that which would be required to turn the wheel. You add that the water may be allowed to flow freely through the waste-gate, provided the opening of such a waste-gate shall not deprive the mill of the necessary supply of water. Eighteenth.--In this clause you say that in weirs already constructed it shall be lawful for the commissioner, on the application of any two or more persons interested in the fisheries of such river, and at the proper costs and charges of the persons making such application--proof having been first given, &c.--to cause a survey to be made of such dam or weir by a competent engineer, and to direct such alterations to be made therein as shall, in the opinion of the commissioner, be necessary and desirable, &c. In this clause, which so far as it goes is very desirable, you have omitted a proviso without which it could never pass into a law. You have forgotten to provide for the legal right of the millowner, which would, or might, be taken away by the alteration made in the weir unless there were some provision in the act which prevented this being done. At present there is no such proviso in your act. Here I have offered for years to allow the upper proprietors to make any alteration they liked in the weir, provided such alterations did not affect the milling power, the stability of the weir, or my legal title to the weir as existing at present. And my legal adviser tells me that any alteration made in the weir without a guarantee from the upper proprietors would very probably deprive me of my present title. * * * * * LETTERS ON AGRICULTURAL SUBJECTS. * * * * * ON THE CULTIVATION OF WHEAT ON THE SAME LAND IN SUCCESSIVE YEARS. _To The Editor of the "Manchester Guardian."_ CLITHEROE, October 5th, 1843.