and a half times my estimate. Now, let us compare the difference. The three-mile channel at the upper end of Tsungming has an average depth of twenty feet of water, while in my project the sea wall or dikes will be built in water having an average of less than two thirds of this depth. Moreover, the work of blocking up the North Channel entirely at a right angle is many times more costly than that of building a rudimental dike of the same length in a parallel line with the current. Since five hundred thousand dollars are enough to block up cross-wise a mile of river twenty feet deep, two fifths of that sum should be quite sufficient to finance the work that I have projected. While writing this, I came across an article in the Chicago Railway Review, May 17, 1919, dealing with the same subject, which states that steel skeleton is a better and cheaper substitute for stone or other materials for building dikes and jetties in a muddy river like ours. Thus, by this new method, we may be able to construct embankments, with cheaper material than I have hitherto known. So, although the estimate which I have made may be somewhat low, yet it is not so far from correct as it seems at first sight.
PART III
The Construction of River Ports
The construction of river ports along the Yangtze between Hankow and the sea will be one of the most remunerative propositions in our development scheme.
