. Canadian engineer. me-mortar masonry has lasted remarkably well. The centralopening in the dam, seen in the view, doubtless originallycontained a wooden controlling gate which was left openin time of flood and was closed only when it was desiredto divert the water into the irrigation conduit, which con-nected with the dam near its north end. One reason forthe location of the dam at this point is that the river hereflows over bedrock at the head of a long canyon, so thatall the flow down the valley is intercepted by the dam. In 338 THE CANADIAN ENGINEEE Volume 30. recent xears Ihe dam has Ije
. Canadian engineer. me-mortar masonry has lasted remarkably well. The centralopening in the dam, seen in the view, doubtless originallycontained a wooden controlling gate which was left openin time of flood and was closed only when it was desiredto divert the water into the irrigation conduit, which con-nected with the dam near its north end. One reason forthe location of the dam at this point is that the river hereflows over bedrock at the head of a long canyon, so thatall the flow down the valley is intercepted by the dam. In 338 THE CANADIAN ENGINEEE Volume 30. recent xears Ihe dam has Ijeen used as a river-gaugingstation bv llie Lnited Slates tieologiial Siir\ey. From llictiam the masonry conduit follows down thenorth bank of the river about three or four miles to thelands around the old mission. Much of the conduit is stillplainly \isibie from the highway on the opposite construction of the conduit is shown in the accom-panying cross-section drawing. Over a pari of its course, HubbleMasonry. Tile varies fromliui^in thickness Tile andSfone laid in Lime Morfar Fig. 2.—Typical Cross=section of Old Mission ConduitNear San Diago, California. however, the conduit was in exca\ation and appears tohave been mel^elv lined with masonry. The size of thetiles used for lining is particularly noteworthy and evi-dences the considerable ability of these early pioneers inthe art of pottery manufacture and in utilizing Indianlabor for this more or less techni<-al work. DISCUSSION ON ECONOMIC AND STRATEGIC ASPECTS OF ENLARGEMENT OF WELLAND CANAL AND OF CONSTRUCTION OF GEORGIAN BAY SHIP CANAL. AT a general section meeting of the Montreal Branch,Canadian Societv of Civil Engineers, Col. W. Leonard presented his paper on Economic andStrategic Aspects of Enlargement of WellandCanal and of Construction of Georgian Bay Ship Leonard stated that he had prepared this paperfour years ago while in the government service, and thatit was not intended as a criti
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