GROWTH OF THE SALMON. 317 



wire in the upper lobe of the caudal fin. Those marked and 

 retaken in 1841 were marked with brass wire in the dorsal 

 fin. "With these and other precautions, Mr. Young debarred 

 the possibility of any mistake as to the lapse of time. Both 

 grilse and salmon return uniformly to their native streams ; 

 at least it very rarely happens that a fish bearing a particular 

 mark is found except in a river where it was so marked. 

 Salmon in the perfect state, as to form and aspect, also increase 

 rapidly in their dimensions on again reaching the sea. A 

 spawned salmon weighing twelve pounds was marked on the 

 4th of March, and was recaptured on its return from the sea 

 on the 10th of July, weighing eighteen pounds. 



Mr. Young is of opinion that salmon rather diminish than 

 increase during their sojourn in rivers, and he illustrates this 

 and other points of his subject by numerous experiments and 

 observations. 



CLASOdW: rUlMEI) liY HAY NISISET AND CO. 



