22 The Salmon 
smolt was wanted, the box was raised and the water ran through the 
holes. One man caught the smolts and handed them to the one who 
held them in position whilst they were being marked. They were 
instantly dropped into the river again, and swam away at once. 
The greatest care was taken to mark nothing but smolts of Sa/mo 
salar, all parr and yellow fins being rejected; so that so far as we could 
judge nothing but smolts were marked. I intended all the smolts to 
be marked in the same place—in the gristly part in front of the dorsal 
fin; but after a time the markers began to take in two rays of the 

Fic. 19.—Marked Grilse, 34 lbs., 3rd July 1906. Smolt marked May 1905. 
fin without my observing it. On discovering this, I decided to do 
the marking again another year, as I was afraid the aperture would 
grow upwards with the fin and the wire would fall out, thus making 
our work go for nothing. We watched carefully during the whole 
of the summer, but no marked fish were found. On the 1st of June of 
the following year we got the first wire in a grilse which weighed 
2 Ibs. 15 oz. “Nhe mark and ahe wish are shown i Fics a7 
The mark was slightly spoiled with the net. This grilse with 
the mark on it (Fig. 14) we handed over to the Perthshire 
society of Natural Sciences The! capture’ of this enilse: was the 
means of making our manager, Mr. David Robb, our Secretary, 
Mr. Harry Robb, Mr. W. M‘Nicol, and Mr. John Robertson 
