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 means of the experiment : — 
The following 
Temperatures in Degrees Cent. 
Current. 
203° — 142° = 61° . 
64-5 
142° — 100° = 42° . 
48- 
100° — 76° = 24° . 
30- 
With more sensitive galvanometer, — - 
320°?— 205° = 115°? . 
120- * 
205° — 143° = 62° . 
64-5 
143° — 102° 41° . 
42* 
102° — 76° = 26° . 
28-5 
6. Eemarks on the Deep-Water Temperature of Lochs 
Lomond, Katrine, and Tay. By Alexander Buchan. 
In the communications made by Sir Bobert 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-°0, from which it fell, on descending, till at 300 feet below the 
surface it stood at 42°-0, and this temperature of 42°*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°-0 ; at 150 feet, 42°*1 ; and from 200 to 594 feet, 42°-0. 
Hence it appears that there is a stratum of water of considerable 
thickness at the bottom of this loch 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°‘ 
