ALASKA SALMON INVESTIGATIONS IN 1901. 
355 
about 100 feet to the northward of the main building. The bottom is gravelly, with 
rocky outcrops in places. There is a cascade of two falls of 5 feet each about 200 
yards from the mouth, and about 100 feet beyond this point the stream receives a 
small tributary from the eastward, the bottom of which is gravelly. Temperature 
of feeder 43° F. ; temperature of lake water 43' F., of lake outlet 50° F. 
The hatchery supply is carried from a point just above the cascade for a distance 
of 325 feet in a Hume, the drop of the flume being 12 feet in its length. Outside the 
hatchery the water is received in a settling tank, 2 feet by 4 feet by 1 foot, partially 
filled with gravel. A spout 2 ? inches by 3 inches leads from the tank into the 
building, dropping 2 \ feet to the head trough. 
In the feeder near the hatchery are two nursery pools (A and B), formed by 
double barricades, and covered with boughs to shade the fry and protect them from 
birds. 
The hatchery building is 50 feet by 26 feet, with side walls 10 feet high, of plank. 
There are 10 troughs, each 20 feet long, the bottom 12 inches wide, being set in the 
sides, which are 8 inches deep. They are arranged in 4 batteries, 3 of two troughs 
each and 1 of four troughs, that is, a double run. They extend lengthwise of the 
building and are equally distant from each other and from the sides of the building. 
The basket divisions are 2^ feet in length, and the division plates, 4 inches apart, 
are made of light-weight iron, asphalted. The head trough is of the same material 
