INVESTIGATIONS IN MINNESOTA AND NORTH DAKOTA. 365 
\trematodea appearing as black dots about the size of a pinhead. Others 
‘were affected by what seemed to be a small white worm encysted just 
‘under the skin. 
| Mouse River, Minot, N. Dak., August 6.—This station is located just 
‘where the ground begins to rise into the foothills of the mountains. 
‘The stream flows through a valley one-half to three-fourths of a mile 
‘wide, lined on either side by eroded and rounded hills from 50 to 75 feet 
‘high. The stream will average 10 yards in width and from 2 to 24 feet 
in depth. The bed is of drift stones, coarse gravel, and mud, the 
latter always supporting a growth of vegetation, of mints, grasses, 
orrushes. The stream is a good one for fish; while the water is not 
clear, it has only enough sediment to cause it to look cloudy in the 
‘deeper places. There are numerous ripples in the stream over which 
the water runs at the rate of 34 to 4 miles per hour. Several species 
of fishes are common. Black suckers are reported as being especially 
abundant during the spring and fall rises. Crawfish were taken by 
hundreds at almost every haul of the seine; a few clam shells were also 
Observed. Univalves and the small crustaceans were rare, as were 
also alge and other vegetation living entirely in the water. 
English Cooley, Grand Forks, N. Dak., August 10.—The English Cooley 
is a small drain 2 miles west of Grand Forks. During a greater part 
of the year it has no current whatever. The banks are low and the 
water is filled with vegetation. It contained a few species of fishes, 
crawfish, and water insects. The predominating fishes are Catostomus 
teres and Pimephales notatus, both covered with parasites. The mud 
in the bottom of the stream was deep and the water at the bottom very 
clear. 
Red Lake River, Grand Forks, N. Dak., August 12.—This is the largest 
eastern tributary of the Red River of the North, and is different in 
many respects from the other tributaries of that stream. It drains 
Red Lake, a double lake 600 square miles in area, lying in the northern 
partof Red Lake Indian Reservation. The general course of the river 
is west, although it makes two great curves. Unlike most other streams 
of this region, this river starts toward the northwest and continues 
thus until more than half the distance from the lake to the Red River 
of the North is covered, then it turns suddenly toward the soith and 
southwest and then again takes a northwesterly direction, which it 
pursues until it joins the Red River of the North. Another stream, 
Clearwater River, rising south of Red Lake, follows the same general 
direction as Red Lake River. Red Lake River is nearly as wide as the 
Red River of the North, but much more shallow. It is very rapid and 
the waters are of a reddish tinge. This difference in the color in the 
waters of these two rivers is very marked, especially when the Red 
Lake River mixes its waters with the whiter waters of the Red River 
of the North. 
_ The bed of the river is of clean sand, a feature with which we do 
ri 
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