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pond along with the trout, and when that pond was drained in 
my presence, November 28th, 1883, several were obtained ; 
three of these I sent to the Heonomic Fish Museum at South 
Kensington, one I retained and examined, it was also a male 
(see P.Z.S., 1884). Several were transferred to pond No. 11. 
November 14th, 1884, on pond No. 11 being drawn, three of 
the above hybrids were captured, the largest being 16} inches 
long ; they appeared to be in good health, but none had shown 
any tendency to spring out of the ponds at the spawning time. 
December 24th, 1881, about 20,000 eggs of Lochleven trout 
at Howietoun were fertilized with salmon milt obtained from 
the Teith. They hatched on March 9th, 1882, or in 75 days. 
In due course the fry were removed to a planked pond at 
Howietoun, 20 ft. long by 5 ft. wide, and 1} ft. deep. Through 
this a stream flows, entering at its upper and making its exit at 
the surface at its lower end. On November 15th, 1882, the 
largest fish was 44 inches in length. On March 138th, 1884. 
these hybrids (numbering 212, the largest six being over 10 
inches in length, the majority smaller, while a few did not 
exceed 24 inches, and all apparently in excellent health,) were 
transferred to the octagon pond at Craigend, the diameter of 
which is 20 ft., and its depth 4 ft.; its sides and bottom are 
planked, while the stream which supplies it flows in at about 
1 ft. below the surface and passes out at the lower end at the 
same level. This stream rises from springs about half a mile 
away, and before reaching the octagon pond goes through two 
100 ft. ponds, which are stocked with Lochleven yearlings, con- 
sequently anything deleterious in the water must first affect these 
small fish. These fish did not attempt to spring out of the pond 
until May, 1885, or when thirty-eight months of age, and in a 
similar manner to smolts when becoming grilse. On May 24th, 
one which was found dead was opened, and proved to be female 
with the eggs developing, and which, had it lived, would 
evidently have bred that winter. In June, 1885, the 
water in the Craigend burn, which supplies this pond, 
became very low, although during that month it never 
quite ceased flowing. That in the pond became so dis- 
