220 



in deptli. From the same data were constructed ten vertical sections of the 

 bottom. In constructing the vertical sections a base line was drawn from Pick- 

 wick Park to Mineral Point, and seven of the vertical sections, from "A" to 

 "G" inclusive, were made at right angles to this line at intervals varying from 

 one-quarter of a mile to two-thirds of a mile. Vertical section "H" is a short 

 distance east of No. 18, "I" is along No. 4, and "J" along No. 25 of the lines 

 of soundings in the main lake. The remarks on the topography of the bottom 

 are drawn largely from a study of these contour lines and vertical sections. 



The average depth of the lake, found by taking the average for the soundings 

 at regular intervals of 300 feet along the lines of soundings is 21 feet 6 inches in 

 the main lake, 13 feet 6 inches in Syracuse Lake, and 20 feet 5 inches for the 

 entire lake. By a different method, as explained in his report. Dr. Eigenmann 

 has computed the average depth at a little more than 17 feet. The maximum 

 depth found in the main lake is 68 feet 7 inches, one-quarter of a mile from the 

 •southern extremity of Jarrett's Bay; 1,000 feet northeast of the Biological Station 

 a depth of 66 feet 5 inches was found; three-quarters of a mile north and one- 

 (juarter of a mile west of the Station the water is 60 feet deep; and a half mile 

 northwest of Black Stump Point it is 63 feet 3 inches deep. The deepest water 

 found by us in Syracuse Lake is 28 feet 10 inches. A depth of 35 feet is recorded 

 for this lake in the State Geologist's Keport for 1875. 



An examination of the contour lines of the map shows that if we consider 

 water having a depth of 30 feet or more as deep water, we have in the main lake 

 four areas of deep water varying greatly in size, and connected with each other 

 by channels. 



In Crow's Bay the greatest depth found was 49 feet 9 inches. These waters 

 enter the main body of the lake through a channel deeper than 30 feet, and 200 

 feet wide at its narrowest point. This channel flows across the mouth of John- 

 son's Bay, meeting a short arm deeper than 30 feet from that bay, and comes 

 within 600 feet of the southeast extremity of Ogden Point. This channel con- 

 tinues less than 400 feet wide to a point two-thirds of a mile west of Ogden Point 

 where it joins the channel deeper than 30 feet from Jarrett's Bay. Tlie deepest 

 water in Jarrett's Bay is 68 feet 7 inches, and the area deeper than 30 feet is one- 

 fourth of a mile wide, extending north beyond the mouth of the bay and to 

 within 700 feet of its southern shore. This 30-foot depth joins the main body of 

 the lake a half mile north of Clark's Point where the channel 30 feet deep is only 

 100 feet wide. Turning to the west, 1,000 feet northeast of the Biological Station 

 this channel deepens to 66 feet 5 inches, and widens to a half mile directly north 

 of the Station. Here it meets the narrow channel 30 feet deej) from Crow's Bay. 



