152 GILPIN ON THE CONSTRUCTION OF A BEAVER DAM. 



been bonded for $45,000. Some of the ledges were in granite, and 

 carried galena containing |210 of silver to the 2000 pounds. One 

 location I visited, not bonded, had two shafts sunk 26 feet deep, 

 100 feet apart, both showing solid carbonate ores valued at $56 per 

 ton. The width of the deposit has not yet been proved, or the 

 length either. Returning we came by the old overland route, now 

 deserted, and got safely through the sloughs where, in olden times, 

 so much mail matter was used as ballast ; we passed high crags of 

 black limestone : passing the ' ' divides " of the Dugway and Point 

 of the mountain into Rush Valley. We were. four days also in 

 returning : the last day doing 65 miles from 7 a. m. to 2 a. m. 

 We camped out also once on returning near the Dugway, and had 

 rather a cold night, for one inch of ice formed in the puddles from 

 the melted snow accumulated the day before. Other nights we 

 slept on the floor of cabins, or small shanties. 



Art. IX. On the Construction of a Beayer Dam in Digby 

 County, Noya Scotia, Sept., 1871. By J. Bernard 

 Gilpin, A. B., M. D., M. R. C. S. 



{Read March 11, 1872.) 



On the 14th September, 1871, we left the town of Digby, and 

 skirting along the southern ridge of those low Silurian hills which 

 under the name of South Mountain, Horton Mountain, and Ardoise 

 Hills, run north-east and south-west almost the entire length of 

 Nova Scotia, we came after descending their southern slope to the 

 lake basins forming the upper waters of the Sissiboo River, falling 

 into St. Mary's Bay. 



We passed Grand Lake, having now abandoned our horses for 

 canoes, and were floated gently over lakes, lakelets, rapids, and 

 still waters, till on the 18th we camped at South-west Falls, about 

 thirty miles south of Digby. Here the granite, that we had on our 

 left almost from Digby, occurring in dykes of porphyry, with large 

 crystals of white felspar, pervaded the whole scene. The lakes 

 were studded with granitic boulders, their milky- white shores were 

 granite sand, the rapids foamed through boulders, and we toiled 



