ARTIFICIAL BREEDING OF SALMON. 201 
released into the tub of water from which she was 
taken. The dish, by the way, must previously have 
been nearly filled with water. Before operating on 
the male fish, the water from the dish had better be 
drained off, and fresh poured in, The male fish is then 
taken and handled in the same way. .A small quantity 
of milt, just sufficient to discolour the water after bemg 
gently stirred with the fingers, is sufficient. It is then 
put back again into the tub, and while the female 
is again being brought out, the contents of the dish 
are to be emptied into another tub half filled with pure 
water. When all the roe has been pressed out and 
fructified as before with the milt, and again emptied 
into this tub, the water is allowed to run out through 
a hole previously bored in the side about an inch above 
the bottom.. By the motion of the water running out, 
all the eges will be brought into contact with the milt. 
In about five or ten minutes the ova can then be 
removed into the hatching-boxes. 
If the eggs are in a fit state, the very smallest 
pressure is sufficient to squeeze them out; and it has 
been found that with due care the female suffers no 
injury from the manipulation, and will be as fruitful the 
following year as ever. | 
The unfruitful eggs after they have been some time 
in the hatching-boxes will be covered with a peculiar 
parasitical plant, “ Leptonutus clavatus,” which gives 
