416 BULLETIN OB THE BUREAU OF FISHERIES 
Table 8. — Results of chemical analyses of the waters of Karluk, Thumb, and O’Malley Lakes in 1927 
[The results are stated in milligrams per liter of water, Tr. = trace] 
KARLUK LAKE, STATION 1 
Date, 1927 
Depth 
in 
meters 
Tem- 
pera- 
ture, 
°C. 
pH 
Carbon di- 
oxide 
Oxy- 
gen 
Phosphorus 
Silica 
Nitrogen 
Free 
Fixed 
Solu- 
ble 
Organ- 
ic 
Total 
Amnio- 
nia 
Nitrite 
N itrate 
July 19 
0 
11.3 
8.4 
1.0 
9.5 
0. 002 
0. 004 
0. 006 
0.0 
0. 008 
Do — 
120 
4.2 
7.0 
4.0 
9.0 
11.3 
.6 
.040 
Tr. 
0. 030 
July 31 
0 
11.4 
8. 2 
1.0 
9.5 
.002 
.003 
.005 
.5 
.000 
.012 
Do. 
13 
8.9 
8.0 
1.0 
.002 
.5 
Do .. 
122 
4.3 
7.6 
2.0 
.010 
Do 
125 
4.3 
7.5 
3. 5 
9.5 
12. 1 
.010 
. 5 
.050 
.001 
.052 
Aug. 13 
0 
11. 1 
8.2 
1.0 
9.5 
.002 
. 028 
.030 
0 
.004 
.000 
Do 
125 
4.4 
7.5 
3.5 
9.5 
.008 
!oi4 
, 022 
.5 
.022 
.000 
KARLUK LAKE, STATION 2 (THE THUMB) 
July 20 - 
0 
11.2 
8. 2 
1.0 
9.5 
.002 
.003 
.005 
Do 
40 
5.5 ! 
7.2 
3.5 
10.0 
.010 
. 020 
Aug. 2 _.l 
0 ! 
11.2 ! 
8.2 
1.0 
.002 
.018 
.020 
0 
.000 
.000 
.035 
Do 
10 | 
10.8 , 
8. 0 
1. 5 
.003 
.022 
.025 
0 
.030 
.000 
.035 
Do - 
41 
5.5 | 
7.4 
3.5 
.006 
.014 
.020 
0 
.060 
.000 
Do 
42.5 
5.5 
7. 2 
8. 5 
9.6 
.015 
. 5 
. 120 
.000 
.050 
Aug. 12 
0 
11.0 
8.6 
0 
10.0 
.002 
Tr. 
.000 
Do 
40 
5.6 1 
7.6 
.010 
Do 
41.5 
5.6 
7.2 
2. 5 
io. o' 
. 018 
.012 
.030 
. 080 
Tr. 
THUMB LAKE 
July 23.. 
Do 
Aug. 10. 
0 
12 
0 
11 
13.1 
12.8 
13.2 
12.2 
7.2 
6.6 
8.0 
7.4 
1.5 
3.0 
1.5 
2.8 
10.0 
10.0 
9.0 
9.5 
6.3 
.003 
.007 
.003 
.005 
.044 
.041 
.032 
.035 
.047 
.048 
.035 
.040 
0 
.5 
1.0 
1.5 
.008 
.084 
Tr. 
.020 
.000 
.000 
.056 
.052 
Do 
10.5 
BOG POND 
July 30 
0 
17.0 
7.8 
2.5 
| 11.0, 
| .000 
1.5 
.000 
No complete series of dissolved oxygen determinations was made, but samples were 
obtained from the bottom water of each of the three lakes. At station 1 in the deepest 
water of Karluk Lake the lower water was well supplied with dissolved oxygen; the 
quantity ranged from 85 to 92 per cent of the amount required for saturation. A 
smaller amount was found in the lower water of The Thumb Basin of Karluk Lake; 
here the amount reached only 69 to 72 per cent of saturation. A still smaller amount 
was found in the bottom waters of Thumb and O’Malley Lakes where the quantity 
reached only 55 and 58 per cent of saturation, respectively. In spite of the lower 
percentages in the latter lakes, the lower water of all three lakes was well supplied with 
dissolved oxygen, so that all three of them belong to the oligotrophic type. 
The quantity of soluble phosphorus in the surface water of Karluk Lake was 0.002 
mill igram per liter. In Thumb Lake it varied from 0.004 to 0.006 milligram per liter 
and in O’Malley Lake it was 0.003 milligram per liter. The amount of soluble phos- 
