791 
of Edinburgh, Session 1871 - 72 . 
till, however, keeping one wire at a higher temperature than the 
other. The result in this case was as in the former. The current 
was exactly as the difference of temperature. The following are 
the means of the experiment:— 
Temperatures in Degrees Cent. 
203° — 142° = 61° . 
• 
• 
Current. 
64-5 
142° — 100° = 42° . 
• 
A 
do 
100° — 76° = 24° 
• 
• 
CO 
© 
more sensitive galvanometer,— 
320°?— 205° = 115°? . 
9 
• 
120- * 
205° — 143° = 62° . 
• 
• 
64-5 
143° — 102° = 41° . 
• 
• 
42- 
102° — 76° = 26° . 
• 
• 
28-5 
6. Bemarks on the Deep-Water Temperature of Lochs 
Lomond, Katrine, and Tay. By Alexander Buchan. 
In the communications made by Sir Bohert Christison to the 
Society in December and April last on the deep-water temperature 
of Loch Lomond, from observations made by him with a Miller- 
Casilla thermometer, these important facts were stated :— 
(1.) On 12th October 1871, the temperature at the surface was 
52 -O 0, from which it fell, on descending, till at 300 feet below the 
surface it stood at 42 o- 0, and this temperature of 42 o, 0 was uni¬ 
formly maintained at greater depths or to 518 feet, the depth of 
the loch at the place of observation. 
(2). On 18th November following, the surface temperature was 
46 o, 0; at depth of 250 feet, 42 0, 25 ; at 270 feet and lower depths, 
42°*0. 
(3.) On the 10th April 1872, the temperature at the surface was 
43 o, 0 ; at 150 feet, 42°T ; and from 200 to 594 feet, 42 o, 0. 
Hence it appears that there is a stratum of water of considerable 
thickness at the bottom of this locli of uniform temperature ; that 
the upper surface of this stratum of deep water of uniform tempera¬ 
ture was about 100 higher on the 10th of April than it was in the 
* Results varied considerably owing to working so near the flame—varying 
from 104° to 126 3 * 
