340 
experiments he has kindly allowed me to be present at, and 
also furnished me with specimens at various times for my 
collection of fishes. ; 
In December, 1880, the owner of Howietoun obtained eggs 
and milt from salmon in the Teith, which were hatched in 
March, 1881: the young were transferred to a plank-lined 
pond, 100 by 15 feet, eight feet deep in its centre and six and 
a half on either side, while one and a half millions of gallons 
of water a day passed through it. In July, 1883, there were 
par and smolts and in 1884 eggs were obtained from grilse like 
smolts, and which were hatched in the establishment. 
I do not propose in this paper discussing grilse, but I wish 
to draw attention to the variations observed in the scales of par, 
smolts or grilse and salmon. | 
DESCRIPTION OF PLATE 
. Upper Figure.—Scale of a par 32 months old, taken from the 
row just above the lateral line and between it and the 
adipose fin; the scale is magnified 74 times. 
Middle Figure.—Scale of a grilse 34 months old, taken from 
the same locality and magnified 12 times. 
Lowest Figure.—Scale of a 16 Ib. salmon, taken from the same 
locality and magnified 12 times. 
49 FER 1886 
