574 



MR. J. A. MILNE ON THE 



only in its fifth year but to have grown very regularly and fast 

 both in summer and winter throughout its life. 



As I have to i"eason largely from analogy, I must now digress 

 for a time from my immediate subject to say a little about 

 what has been discovered from the scales of our salmon, Salmo 

 scdar^ which is also the salmon of the east side of the American 

 continent. 



Text-fiir. 95. 





JM- 



Scale of a Quiunat {Oncorhynchus tscJiawyf.icha) 33^ lbs. Length 41^ ins. ; girth 

 25j ins. Captured at New Westminster, B.C., in 1912. Supposed spawning 

 mark shown at S. 



It appears to have occurred to Leuwenhoeck so long ago as 

 the year 1696, and to Reaumur in 1716, that the concentric lines 

 Avhich are to be found upon the outer surface of the scales of most 

 fishes are formed with some relation to the age of the scale, and 

 therefore must s^ive an indication of the age of the fish to which 



