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Show certain works designed to increase percolation, but also to undertake such measures of improvement as were necessary to prevent the increase due to natural causes, . . • Baden on her side maintained that Wurttemberg was bound to discontinue certain arti- ficial works the object of which was to diminish or prevent such part of the percolation as took place upon YTurttemberg territory» » • . tf. « * The Court laid down that the exercise of sovereign rights by each member of the international community is limited by its duty not to injure the interests of other members, and no state may use the water in such a manner as to cause material injury to another* On the other hand, an attempt must be made to apportion or measure the respective interests in an equitable manner, balancing the advantages gained by one state against the injury, or possible injury, caused to another. This appears to be sub- stantially identical with the doctrine laid down by the United States Supreme Court in the case of Kansas v. Colorado, "• • • Baden was enjoined to abstain from artificial'works calculated to increase the per- colation, and Wurttemberg from such works as were calculated to reduce it. Neither party was declared to be under a positive duty to take active steps for . the improvement of the watercourse, except in so far as Baden was directed to prevent the accumulation of sand and flint along the shore near Mohringen, which had the effect of increasing the natural percolation.11 H, A« Smith, The Economic Uses of International Rivers (1931) 5U-57> In discussing the Question of general principles governing the use of international rivers, Professor Smith statest nSo far as I am aware, there are no strictly international decisions touching the problems dis- cussed in this book, » • • "The treaty provisions, now somewhat numerous, are all directed towards the practical object of securing the most beneficial use of the rivers with which they are concerned, . . , n, • * it is beyond dispute that no rule, what- ever may be its intrinsic merits, can be regarded as effective law until it is established by the |