THE SALMON AND SEWIN. 201 
nide, fish may be observed presenting every grada- 
tion of size from the least to the greatest, it is 
reasonable to infer that their rate of growth is not 
accelerated materially at any subsequent period of 
their existence, especially as individuals of large 
_ dimensions are found to be very disproportionate 
numerically to those of a small or even of an average 
size. 
By the cautious inspection of Salmon and Sewin 
in one of the tributaries of the Conway running 
through my father’s land, up which, when swollen 
with rain in the months of October and November, 
they ascend for the purpose of depositing their spawn, 
and by the frequent examination of their progeny in 
different seasons of the year, I have satisfied myself 
that in their economy as well as in their rate of growth 
these species bear a close resemblance to each other. 
Both remain in large numbers for two years in the 
fresh water after their extrication from the ovum, 
during which period, notwithstanding the result of the 
conclusive experiments so skilfully conducted by Mr. 
Shaw, of Drumlanrig, they are still indiscriminately 
named Parr in this district *, and do not descend to 
the sea till they have acquired their migratory dress 
or have been converted into Smolts, when they usually 
measure from five to seven inches in length, and weigh 
from half an ounce to an ounce and a half. I have 
* A Sewin in its second year more nearly resembles a Trout 
than a Salmon of the same age. 
