36 MR. F. DAY ON RACES AND [Jan. 15, 



Although it appears pretty evident that the number of these parr- 

 bands may slightly vary with the age of the fish, and that they may 

 be broken up in some forms, it is still clear that very great latitude 

 must exist, as we find them occasionally of different numbers on the 

 two sides of the same fish. I will now give the figures showing the 

 bands as existing in the specimens to which I have referred, and 

 most of which are now on the table. 



Three Salmon smolts, hatched March 1881, had, when captured 

 on November 29th, ten finger-marks on either side. 



Two Salmon smolts, from the Hodder, each about seven inches 

 long, had nine or ten fiuger-marks on each side. 



Twenty-two Salmon-fry, the eggs of which came from Canada, 

 gave the following results : — 



Eight specimens at 3 months of age : the bars averaged 8| on 

 each side of the fish, eight was the smallest number, ten the largest ; 

 and the greatest difference in number between the two sides of one 

 fish consisted in eight on one side and ten on the other. 



Five specimens at 4 months of age : the bars averaged eight, 

 while seven was the smallest and nine the largest number ; in one 

 fish there were nine on one side and eight on the other. 



Four specimens at 5 months of age : the bars averaged 8|, while 

 seven was the smallest and nine the largest number ; the difference 

 between the numbers of bars on the two sides of any fish did not ex- 

 ceed one. 



Five specimens 5| months of age : the bars averaged 8| while 

 seven was the smallest and ten the largest number ; the difference 

 between the numbers of bars on the two sides of any fish did not 

 exceed one. 



The general average of bars in these twenty-two specimens was 85, 

 and only twelve out of the twenty-two had so many as nine or ten 

 bars, while in one specimen they did not exceed seven ; the same 

 number being on one side of three others. All the examples of 

 young Salmon had from seven to ten finger-marks along the sides. 



Among the hybrids between the Salmon and the Lochleven Trout, 

 on November loth, 1881, three specimens at 8 months of age 

 had from ten to thirteen finger-marks along the sides. Three of 

 the same batch were captured November 29th, 1883, at 20 months 

 of age : one had twelve bars on both sides, one ten on one side and 

 twelve on the other, and the remaining fish ten on one side and eleven 

 on the other, showing a variation of from ten to twelve bars. 



Among four hybrids between Lochleven Trout and American Charr, 

 captured November 29th, 1883, at 5 months of age, the average 

 number of bars was 9^, the least number being eight, the most eleven, 

 and the greatest difference between the two sides of one fish being two. 

 This shows a higher number of bars than were seen in the young of 

 the true Salmon at Howietoun at the same age, or at the Fisheries ; 

 while only Trout and Charr blood were mixed. As the fish got older 

 these bars broke up and could not be counted. 



Among three hybrids between the American Charr and the Loch- 

 leven Trout, captured November 29th, 1883, at 5 months of age, 



