A474 D. W. CUTLER. 
variation between scales taken from different parts of the body, four 
scales from various regions were examined in 45 cases. It will be seen by 
reference to Fig. 1 that, apart from minor variations, the scales from the 
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Fic. 3.—Scale curves from 2 and 3 year old fish. The letters indicate the same scales in 
Table I. ; the numbers the successive winter zones. 
same fish are very constant. The personal error was eliminated as far as 
possible by measuring these scales on different days, no reference being 
made to any previous measurements before the whole series had been 
completed. 
