CirieRING so As TO Estimate. 389 
continued for several days, and sometimes weeks, by a single 
pair of fish. The male trout or male salmon sometimes forces 
the female to the spawnine-bed before all the ova is suflicient- 
ly matured for deposition.) We then shut down our upper 
sluice, catch and examine all the fish, and keep in a large 
wooden box all the fish ready for manipulation, returning the 
rest to the dam till we see them beginning to spawn a second 
time, and so on till we get them all spawned. 
We spawn them in a box three feet six inches long, seven 
inches wide, and nine inches deep, with as much water as will 
cover the fish. We first take the female fish from a large box 
filled with water close at hand, lay her in the little box as she 
swims (that is, her back up), taking her by the tail with the 
right hand, and with the left hand gently press from the neck 
to the vent until you ect all the roe exuded. We then pour 
off about half the water, and use the male fish the same way, 
or 
S 
mixing the milt with the water by the hand. After mixing 
the ova, we have a large filter that fits the neck of a bottle, 
water-tight, with a rim of wire gauze two inches deep. We 
then fill the bottle and filter with water; then, pouring off the 
greater part of the water in the spawn-box, we empty the roe 
and water into the filter. The roe, of course, sinks into the 
bottle; the water runs off through the wire gauze, and pre- 
vents any of the ova from being spilled. The bottle is mark- 
ed off in divisions, each division holding 800 eges of an aver- 
age size, By this way we count our roe with little trouble 
that we deposit in our breeding-boxes. In putting the ova 
into the breeding-boxes, I have a tin tube that fills the neck 
of the bottle, tapering to about a half-inch circle at the top. 
This tube I place below the water in the breeding-box, and 
gradually empty the roe into glass jars. Our breeding-boxes 
are two in number, or rather a continuation of one. They 
are laid quite level, so that the water circulates down the one 
and up the other. The boxes are made of wood, four inches 
deep, one foot wide, and the length of the two boxes com- 
bined is 135 fect. These boxes are supplied with frames in- 
