than usual at the season of the usual minimum, and more plentiful than usual in August, 

 when the curve rises into a small secondary maximum. There is again no sign of a 

 falling off from year to year, but in this case rather an indication of a slow increase in 

 the supply. 



A study of this curve reminds us that in speaking of increase or decrease of fish 



iOOi 



1902 



1903 



1904. 



1905 



1906 



20 



ÉÏ 



ïi"^. 



^ 



Î 



4 



/ 



t 



I: 



S: 



t 



I 



X 



;? 



^- 



i 



X 



1 



± 



^:g 



W: 



:s=;2^ 



FiR. 6. Codling. Area XXIX. 



from year to year we are apt to confuse two different things. A comparatively small 

 body of fish remaining a long time on the ground may be more profitable to the fisher- 

 men than a larger body making a briefer stay. The former condition may swell the local 

 catch for the season, and yet the latter may possibly be associated with a greater abund- 



1901 



1902. 



1903 



1904- 



1905 



1906 



'I 



30 



9.0 



n. 



^' 



Î 



n 



m 



^ 



?- 



^: 



^ 



I 



^^z-. 



I 



!3 = ! 



S;- 



^: 



Fig. 7. Cod. Area XXIII. 



ance of the species as a whole. The case is only one instance among~many of the 

 difficulties that confront us in attempting to answer the ill-defined question of whether 

 our fish-supply is being depleted or not. 



In area XXIII the continuous curve for Cod (fig. 7) is not quite so regular as in 



