directly north towards the Hot Springs at the northern
end--a distance of about eighteen miles--we have the following
depths:

_Station Depth in Feet Depth in Meters_

1 ............... 900 274.32

2 ............... 1385 422.14

3 ............... 1495 455.67

4 ............... 1500 457.19

5 ............... 1506 459.02

6 ............... 1540 469.38

7 ............... 1504 458.41

8 ............... 1600 487.67

9 ............... 1640 499.86

10 ............... 1645 501.39

These figures show that this lake exceeds in depth the deepest
of the Swiss lakes (the Lake of Geneva), which has a maximum
depth of 334 meters. On the Italian side of the Alps, however,
Lakes Maggiore and Como are said to have depths respectively
of 796.43 and 586.73 meters. These two lakes are so little
elevated above the sea that their bottoms are depressed 587
and 374 meters below the level of the Mediterranean.

(2.) _Relation of Temperature to Depth_. By means of
a self-registering thermometer (Six's) secured to the
sounding-line, a great number of observations were made on the
temperature of the water of the Lake at various depths and
in different portions of the same. These experiments were
executed between the 11th and 18th of August, 1873. The same
general results were obtained in all parts of the Lake. The
following table contains the abstract of the average results,
after correcting the thermometric indications by comparison
with a standard thermometer:

Obs. in Feet in Meters F. deg. in C._

1 ...... 0-Surface 0-Surface 67 19.44

2 ...... 50 15.24 63 17.22

3 ...... 100 30.48 55 12.78

4 ...... 150 45.72 50 10.00

5 ...... 200 60.96 48 8.89

6 ...... 250 76.20 47 8.33

7 ...... 300 91.44 46 7.78

8 ...... 330 (Bottom) 100.58 45.5 7.50

9 ...... 400