326 
answered that “when the natural warmth comes into the water 
in the month of March, the fry generally rise, and they continue 
going down from that time until the lst May; sometimes I 
have seen them going down till the month of June,” (page 115.) 
Mr Hoearrts, in May, 1824, when samlets were descending 
the Don, had a number of them captured and marked, by 
cutting off the mort or dead fin. During the month of July 
several grilses were taken without that fin, whence he inferred 
that they were some of the fishes which he had previously 
marked. Not only did samlets thus become grilses in a few 
weeks, but in the following year, 1825, he got three salmon, 
marked in the same way, which he also considered to be some 
of those individuals he had marked originally as samlets. In 
September, 1824, he caught ten or twelve grilses, which were 
put into a salt water pond. Owing to high tides some escaped. 
but there were three alive the following May; these were taken 
out and: examined in the presence of many competent judges, 
who were all decidedly of the opinion that they were real 
salmon. These experiments showed not only the growth of the 
smolt or samlet into grilse or botcher, but also that of the grilse 
into the gilling or salmon of one year’s growth. 
One must however decline assenting to some of Mr Extis’s 
conclusions (“‘ Natural History of the Salmon,” in the Edinburgh 
New Philosophical Journal, 1828, page 250 et seq.) viz., that 
salmon “frequently propagate their kind during the first year 
of their age,” or that “in the first five months of its existence, 
that is, from April to August, both inclusive, it reaches, in 
favourable circumstances, to about eight pounds in weight, or 
grows at the average rate of about 1 lb. 9} oz. a month; that 
from September following to March, seven months, it acquires 
seven pounds additional weight, which is at the average rate of 
about 1b. 12 oz. per month; and lastly, that through the next 
twelve months it gains ten pounds more, or weighs thirty-five 
pounds, which is somewhat more than 13} oz. per month.” 
Furmine (History of British Animals, 1828, page 179) speak- 
ing of the young of the salmon, remarks, “the fry leave the 
spawning groove about March, retire to pools, and proceed 
