TENTH ANNUAL REPORT. 73 



positing thereon earth which was excavated near by, in Lake 

 Agassiz. 



The work of deepening the lake, begun last year, was com- 

 pleted in a satisfactory manner. A channel was dug to conduct 

 a portion of the main current of the stream around the south- 

 ern side of the island near the Concourse, and correct the stag- 

 nant condition of a large water area that long had needed this 

 remedy. A small wing dam was built to make this improvement 

 effective and permanent. The banks of Lake Agassiz were care- 

 fully graded, with a view to restoring as far as possible the 

 appearance of natural conditions. In a few places sandy shores 

 were made ; but the amount of sand available for this purpose 

 was much too limited for a perfect effect. 



Henceforth, the mass of aquatic vegetation w^hich previously 

 grew up every summer and choked the water area of Lake 

 Agassiz will be seen no more. It is hoped that in 1906 funds 

 will be available for the proper planting of this region, which 

 when done will complete the restoration of what is unquestion- 

 ably the most beautiful landscape in the Park. 



Fence North of Lake Agassiz. — The outbreak of sheep-killing 

 dogs, which occurred in the month of July, forced upon the 

 Society the necessity of immediately fencing the northern shore 

 of Lake Agassiz, to prevent dogs from swimming the lake and 

 river, and thereby entering the Park. To meet this imperative 

 necessity for protection about 2,500 feet of Page wire fence was 

 erected on steel posts, and the usual run of dry rubble pave- 

 ment was laid inside, close along the fence, to prevent dogs 

 from digging under. Two floodgates and barriers, of iron wire 

 and wood, are, with the approval of the Park Department, now 

 being erected, to swing underneath the two bridges to prevent 

 the ingress of dogs over the ice in winter. As soon as these 

 gates are in place a collection of water fowl will be placed on 

 Lake Agassiz, in accordance with the Society's original plan. 



Water Supply to Beaver Pond. — In dry seasons the supply of 

 water to the Beaver Pond always has been inadequate ; and the 

 brook which occasionally flows through the beech woods into 

 Lake Agassiz has nearly always been dry. In order to thor- 

 oughly and permanently improve both those conditions, it was 

 decided to establish below the waterfall an automatic pump, with 

 water power from the lake, to pump lake water into the head 

 of the Beaver Pond. Accordingly, a 12-inch hydraulic pump- 

 ing engine was purchased, and will be put in operation early in 

 the spring of 1906. Meanwhile, a pipe line consisting of 1,900 



