Irregularity in the growth of the salmon

In the proceedings of the Zool. Soc. of London for 1870, Part 1, which reached our library only a few weeks back, I find a paper by Dr. James Murie, F.L.S. , Prosector of the Society, entitled "Additional Memoranda as to Irregularity in the Growth of Salmon," so completely bearing out my often expressed conviction that the difficulty of determining the various species of the salmonidse from immature specimens amounts almost to an impossibility, that an extract may prove interesting.