SALMONIDZE. 65 



But in reply, it was stated that Parr had also been marked and 

 retaken as Bull Trout, Salmo Eriox, and Salmon Trout, Salmo 

 Trutta ; whence it was argued that the fish marked had been so 

 marked carelessly and injudiciously, and were not Parr at all, but 

 Smolts, or fry of some of the other Salmonida. Mr. Yarrol 

 admits that he has seen these vertical marks in the young fry of the 

 Salmon, Bull Trout, Parr, common Trout, and Welch Charr ; but 

 still maintains the existence of the Parr as distinct, principally on the 

 ground that the Parrs are taken abundantly even in autumn, not 

 exceeding five inches in length, long after the fry of the larger migra- 

 tory species have gone down to the sea. 



This is in the body of the work, written previous to the experiments 

 made by Mr. Shaw ; and this Mr. Yarrel there considers to be a 

 sufficiently obvious proof that the Parr is not the young of the Salmon, 

 or indeed of any other of the larger Salmonidce. 



The reason is of course annihilated by the proven fact, that the 

 Pinks, which remain in fresh-water all the first year, are young Sal- 

 mon, Parr-marked ; whereas the young Salmon-fry, Smolts, formerly 

 supposed to be the young fish of that year, all of which have gon3 

 down the river to the sea, are in truth the fish of the preceding year. 



Similarly is the question settled with regard to the existence of 

 Parrs in streams of the Western isles which are never visited by 

 Salmon, these being, in all probability, the Brook Trout in the Parr 

 stage of its existence. 



And so again the fact that there are lakes in the same islands fre- 

 quented by the Salmon and sea Trout, in which Parrs are never found 

 because the young fry, while in the Parr, or transversely banded, 

 form, keep in the swift cold streams, and do not descend to the lakes. 



It now appears to be certain, or as nearly certain as anything can 

 be, which is not positively proved, that every species of the Salmonidce 

 is at one period a banded fish, or Parr. 



This is known as an authenticated fact of the Salmon, Salmon 

 Trout, Bull Trout, and common English Trout, as well as of the 

 Welch Charr, as admitted by Yarrel. 



Mr. Agassiz has figured the Hucho, Salmo Hucho, and the conti- 

 nental Charr, which he esteems identical with the northern Charr of 

 England, Salmo Umlla, in the same stage the other characteristics 



