176 Proceedings of Royal Society of Edinburgh. [sess. 
sufficient heed to the necessity for having them in contiguous 
pairs, so as to have for every morning set of observations a corre- 
sponding afternoon set not more than twelve hours apart. Guided 
by this and other considerations, I found myself compelled to take 
a very limited selection of stations, all situated in the Levant. 
These selected stations are given in Table A, along with their 
Table C . — Temperature Differences at Various Depths. 
D tlis . 
o 
2 
5 
10 
20 
30 
50 
70 
100 
Station . 
191-188 
1 
*7 
*8 
1-4 
1 
•8 
1-8 
213-212 
‘5 
•3 
•3 
•4 
0 
T 
•3 
•3 
•5 
220-219 
•4 
•3 
•3 
•2 
•2 
•2 
•2 
T 
•2 
220-222 
•7 
•6 
•7 
•8 
•5 
•3 
T 
- *3 
- *2 
223-222 
•9 
•7 
•5 
T 
•2 
T 
0 
- T 
- -4 
223-225 
•5 
•4 
T 
— ‘2 
T 
- *2 
- -6 
T 
T 
226-225 
•3 
•1 
T 
•2 
T 
•5 
•4 
•6 
*6 
226-228 
•4 
- ‘2 
- *2 
0 
- T 
- *2 
*2 
0 
0 
229-228 
•2 
0 
0 
*2 
•2 
- 1*7 
- 1-7 
- 1-2 
- -6 
229-231 
1*2 
IT 
•8 
•7 
•4 
•4 
•4 
- T 
- T 
232-231 
1 
IT 
•9 
•6 
- 1*2 
- 2-4 
- *2 
- -2 
- -6 
238-235 
•4 
•5 
•2 
- -8 
- 2-3 
- *9 
- *7 
- *5 
- -4 
250-248 
*2 
T 
•2 
•2 
•8 
1-4 
- *3 
- *6 
- -4 
250-252 
- ’1 
- -2 
- *3 
- *6 
T 
- *6 
- -8 
- -8 
- -5 
253-252 
•1 
0 
-•2 
- -5 
- *7 
- 2-0 
- 1-2 
- ‘7 
- -4 
257-259 
•2 
•5 
•5 
•5 
•7 
2*0 
•3 
•4 
•2 
260-259 
•9 
*9 
•9 
IT 
1-4 
•5 
•7 
•8 
•4 
260-262 
0 
- *3 
- *3 
— *2 
*3 
- -9 
-1 
- ‘9 
- -2 
264-262 
•4 
•4 
•3 
T 
0 
1-0 
*5 
- *2 
- T 
Means 
00 
© 
0°'37 
0 o, 29 
0°-22 
0 
0 
to 
- 0°-08 
1 
0 
0 
0 
to 
- 0°T8 
- 0 o, ll 
Probable ) 
Error j 
±•057 
±•065 
±•062 
±•088 
±T2 
latitudes and longitudes, and the date and hour at which the 
observations were made. The number of the station is the number 
in the Pola reports. All the observations here discussed were 
made in September of 1892. 
Table B contains the corrected observations of temperature for 
all these stations at the depths 0, 2, 5, 10, 20, 30, 50, 70, 100 
metres. Most of the observations at the depth 5 are interpolated, 
and are so entered in the Report. The interpolation can be 
effected with considerable accuracy since the law of diminution of 
