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four and a half inches in length, equal to the growth of a brook 
trout in the same water for an entire year. 
Mr Roosevelt also recorded that in the United States Salmo 
confinis had been bred with the whitefish, Coregonus albus; the 
brook trout with the fresh-water herring, Coregonus clupeiformis ; 
the brook trout and the California trout, Salmo irideus. Those 
who refuse to admit that the chars are of a different genus 
from the trout must allow that Coregonus cannot be included as 
pertaining to the genus Salmo. 
Hybrids have been raised between the grayling, Thymallus 
vulgaris and the trout: the eggs of the former from the Lake 
of Pavia having, in November and December, 1872, been 
fertilized with the milt of salmon trout, and hatched in 
January, 1873. These hybrids bred at the age of 22 months 
and 5 days—at least the females did, for the males were found 
to be exhausted, so they were crossed with trout milt. These 
hybrids again proved fertile, and the cross was again tried, but 
unsuccessfully. (Société d’Acclimatation de la France, 1877, 
page 495.) 
In 1882 I received a hybrid from Sir Pryse Pryse, of 
Gogerdan, in Cardiganshire, being a cross between the 
American char which had been introduced, and the brook 
trout; and in 1887 I ascertained that these cross-breeds were 
by no means rare, and several anglers have informed me that 
they interbreed also in the Wandle and elsewhere. 
During Christmas week, 1885, Mr Thomas Ford observed in 
a stream at Caistor, in very shallow and perfectly clear water, 
a female brook trout which had made a large hole, and a male 
fontinalis. There were half-a-dozen more common trout in the 
pool, but the fontinalis drove them all away, although they 
were the larger fish. ‘‘ When shooting its eggs the body of the 
trout was subject to a tremulous motion, whilst its back fin was 
occasionally out of the water. At times the fontinalis remained . 
almost immovable just above the trout, but now and then it 
would go completely over and under the female fish. It was 
quite evident that the female trout preferred the company of 
the fontinalis to that of its own species. This is the second 
