TRANSACTIONS. 249 
separately, along with the state of the river or the mean depth as 
registered at the gauge (which was erected in July), viz. :— 
Air. Water. Dif. State of River. 
Corrected Means for April. 51°3° 458° 55° Average. 
5 May.... 60°5° 56°6° 3°9° Under average. 
¥ June... 65°8° 63° 2°8° Low and very low. 
me July.... 63°3° 60°3° 3° Very low till 10th, 
; then above avg. 
Mean Depth at Gauge— 
us Aug. ... 62°3° 57°) 4:8° 5 feet, 
re Sept....  59°7° 538"1° 6°6° se 
Oct..... 49°6° 45° 46° 5-tane 
Nov... 45:6> 43°1° 25° De2) os 
me Dec..... 40:2° 38°2° 2° Dies: 
a Jan. . 444° 405° 39° Bie 
- Nes)... 428: 38°1° 47° ASMi a 
Ur Mar. .. 48°5° 41°1° Tae £9); 
634° 582'3 
Means for whole year ......... 52°8° 485° 
48°5° 
Mean difference between air 
and water for year ...... 4:3° 
From this table it will be seen that the highest monthly mean 
temperature of the air for the year was in June, when it was 65°8°, 
the mean temperature of the water for the same month being 63°, 
also the highest mean for the year. The lowest was in December, 
when that of the air was 40-2°—water, 38:2° ; but the mean tem- 
perature of February for the water was a fraction lower than this, 
viz., 381°, while that of the air was 42°8°. Range for monthly 
means—air, 65°8° ; water, 38°1°—27°7°. 
The highest single reading for the air was on 31st July “ae aOR 
The lowest single reading for the air was December ... 2 ony 
Extreme range for air... at ar 5500 pA 
Highest single reading for water was on 4th July ah eV OGNGy 
Lowest single reading for water was on 13th February 1k ee 
Extreme range for water ... oa a ne eon 
The months in which the mean monthly temperature of the air 
and water most nearly approximated were: December, when the 
difference was only 2° (¢.e., of air above water) ; November, 2°5°; 
June, 2°8° ; and July, 3°. Those in which the temperature varied 
