69 
II. Sandy or sand and mud bottom 
Quiver Lake 
| | 
| 
“channel” * 803 | 280 65.1 99.6 88.5 
Quiver Lake, Not } 121 | 
sandy shore, separately 
east side valued | | 
* Figures in 1914—1915 columns are for year 1915. 
7 Figures in 1914—1915 columns are for year 1914. 
2. Composition, by weight, of the grand totals, 
all mud bottoms, 2 to 6 feet, pounds per acre 
Liverpool Lake Thompson Lake Dogfish Lake Quiver Lake 
- | | 
1915 1920 | 1915 1920 | 1914 1920 | 1914 1920 
Viviparidae | 
and Pleuro- | 
ceridae 117.0 0 437.9 0 336.0 0 329.7 0 
Sphaeriidae 37° 0 15.6 £0 sh SOA -n 0 1670) 0 
Amnicolidae, | ] 
Valvatidae, | 
etc. 0.5 0; ))) 45:3 0 9.0 OVA et 0 
Chironomidae 25.6 2.2 8.3 3.6 29.6 8.6 5.5 12.3 
Oligochaeta 0 13.6 0 4.5 | 0 4.4 0.4 1.6 
Other insects, 
worms, 
Crustacea, | 
etc. 2.6 0 5.0 0 12.8 OREN) f19:3 0 
Grand total 149.4 15.8 472.1 12.1 397.5 13.0 | 388.3 13.9 
While at the lower gages of the drier months of 1913 and 1914 not 
less than 40 per cent. of the area of Thompson Lake, probably fully 30 
per cent. of Liverpool, and more than 50 per cent. of Dogfish and Quiver 
lakes, was well filled with mixed aquatic vegetation, in 1919 and 1920 at 
substantially the same gages and temperatures, it is certain that for any 
of these lakes 2 per cent. would have been an extravagant figure to set 
