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were merely from two to three inches in length. November 
9th, 1887, they were looking very well. In this case the 
former experiment was reversed, and salmon eggs were milted 
from a Lochleven trout, showing the possibility, but the young 
have not yet been found old enough to breed. 
The next experiment was made in order to ascertain the 
effect of employing the milt from a par or young salmon, in 
order to fertilize the eggs of a mature Lochleven trout. 
November 29th, 1883, about 4,500 eggs were obtained from 
a Lochleven trout which had been hatched early in 1875, and 
these were milted from a par 32 months of age. The number 
of eggs removed as dead during the 78 days they took incubat- . 
ing was as follows :—December, 65; January, 18 ; February, 4; 
or a total loss by deaths of 87; while in addition 199 eggs were 
found to have escaped fertilization. Consequently, although 
the mortality was small, it by no means gave a true index to the 
result of the experiment, for it was soon perceived that the 
young were not a strong and vigorous brood, while weak ones 
are useless for stocking purposes, even should they surmount 
the diseases and dangers of their youth. On February 15th, 
1884, some thousands were hatched, but nearly all were observed 
to be suffering from what has been termed dropsy, or blue 
swelling of the yolk-sac, probably due to insufficient vitality in 
their constitutions. On March 12th, 1884, these young fish 
were of an average length of 0°8 of an inch, but what at once 
struck an observer was the large pyriform umbilical sac which 
seemed to anchor them to the bottom of the tank. Some were 
seen singly, others in groups, while every now and then one 
would start up and swim a short distance in an irregular 
or spasmodic manner, and then sink to the bottom. Under a 
strong magnifying glass there appeared to be a want of vitality 
in the fish, the pulsations being weak, the heart’s activity 
feeble, and the blood deficient in red corpuscles. On June 24th 
they were shifted to the 20 feet pond at Howietoun; on August 
29th, 1884, about 100 were alive; May 6th, 1885, they were 
temporarily placed in No. 4 pond; and on June in pond 382, 
only 58 fish remaining. June 17th, 1886, they were about 
