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that those between salmon and trout may be fertile. First, 
then, comes the question—Can hybrids be fertile amongst them- 
selves, or must they be interbred between one of the parent 
races? On November 24th and 25th, 1885, about 17,500 eggs 
were obtained from struan hybrids, and crossed by males from 
the same breed, they being at that time thirty-three months 
old. They commenced hatching February 11th, and about 
2,000 young came out. Many were very weak, and the mortality 
became considerable. July 30th, 689 fish were shifted to 20 
feet pond No. 3; and on December 27th 450 were moved to the 
botanical pond, which is about four feet deep. About the 
middle of June and the subsequent three weeks, when the 
weather was scorching and the glare great, many were observed 
to commence to lose their colour, to become nearly white, with 
the pectoral, ventral, and anal still showing the red colour. On 
a net being placed near them they did not move unless touched, 
and on being taken out of the pond were found to be blind: 
in those slightly affected in colour the pupil was fixed and the 
colour dull, almost opaque; in those fully affected it was quite 
opaque. At the commencement of July some wood was placed 
over the inlet end of the pond under which the fish crowded, 
but the temperature of the water did not decrease until some 
rain fell on the 5th and 7th, when the fish seemed more lively. 
Some boards were now placed over a portion of the pond for the 
char to get under, but no other locality was available in which 
to transfer them. Here is a distinct instance of fertile hybrids 
breeding together, the parent forms being two species of the 
chars, and which cross has been several times carried out, and 
always with somewhat similar results. 
But it was deemed advisable to cross these struans with a 
Lochleven trout, so that there could be no doubt as to their not 
being varieties of one species. On November 12th, 1884, 4,500 
eggs from two Lochleven trout were milted from a male struan 
hybrid, and hatched in 83 days. Among them were many 
deformities, a few dropsies, and subsequently a high mortality. 
On June 30th, 320 were placed in pond 3. One of these was 
not blind, while there was a black line along the top of the 
