A LIMNOLOGICAL STUDY OF THE FINGER LAKES. 543 
offers as the traveler from Skaneateles first enters it from the south, high up on the slopes 
of its western side. 
Otisco Lake was visited only once. The work was done off Amber, in the deepest 
water. The lake abounds in plankton, as is indicated by the absence of oxygen and 
plankton in the deeper water. Its transparency in 1910 was 3 meters, the least shown 
by any of the lakes, but not much less than several of them. 
For the table of hydrographic details, see page 597. 
LAKES OF THE GENESEE BASIN. 
Honeoye, Canadice, Hemlock, and Conesus Lakes (fig. 3). — These four small lakes 
lie to the west of Canandaigua Lake (fig. i), in narrow valleys, at an average altitude 
decidedly greater than that of the lakes of the Seneca Basin (fig. 2). One of them, 
Honeoye Lake, was not visited by us. The lake is shallow, as is shown by the large 
deltas which have been built out into it by the small streams along its sides. 
Conesus, the westernmost lake, lies farthest to the north, and therefore comes 
nearest to the mouth of its valley. The valley is shallow and has gradual slopes, not 
exceeding 1:5 for a height of 100 meters (over 300 feet). The highest hills adjacent 
to the lake do not reach a height greater than 160 meters (530 feet) above its surface. 
The most interesting topographic feature of the lake is the fact that near its center 
two streams, entering opposite each other, have built out large deltas, which have nearly 
divided the lake. The water is shallow; we formd no depth greater than 18 meters. 
We made soundings along the center of the southern half of the lake, and the greatest 
depth of the lake is probably little, if at all, greater than that found by us. The trans- 
parency of the water was 6.3 meters, which was exceeded only by Skaneateles and 
Seneca Lakes. The oxygen and plankton of the lake show the regular characters 
that belong to a shallow lake. 
Canadice and Hemlock Lakes lie close together in the center of this group. They 
are separated by the height of Bald Hill, which lies between them, much as Bluff Point 
lies between the two arms of Keuka Lake, and which has a form quite similar to that 
of Bluff Point (pi. cxv). It rises, however, to a greater height, since its summit is 
nearly 600 meters (1,850 feet) above the sea, and it rises more than 230 meters (760 
feet) above Canadice Lake and about 290 meters (950 feet) above Hemlock Lake. 
The water of these two lakes furnishes part of the supply for the city of Rochester, 
which lies about 45 kilometers (28 miles) to the north. 
Hemlock Lake is long, narrow, nearly straight, and is singularly uniform in 
breadth. The walls of the valley are steep, the steepest slopes rising 300 meters or 
more in i kilometer. None of the slopes are precipitous, but many of them are about 
as steep as is possible for a wooded slope to lie. Marrowback Hill, on the west of the 
lake, is as steep as Bald Hill on the east and reaches a height some 30 meters (100 feet) 
greater. The sides of both these hills are uniform and are unbroken by valleys or 
projections. Toward the north end of the lake are a few small streamlets whose val- 
leys are almost invisible, and even these are not found along the southern two-thirds 
