— 10 



maximum, of which the explanation probably is that area XXIII shares in an early 

 Spring migration, characteristic of the east coast of Scotland, and also in a Summer one 

 which we shall find to be characteristic of Shetland and other northern regions. To 

 this question we shall afterwards return. 



1901 



1902. 



1903 



1904- 



1905 



I90S 



Fig. 9. Cod. Area XXIX. Percentages of "Cod" in total catch of Cod and Codling. 

 1901 1902 I9Ô5 IÇOif^ 1905 1906 



70 

 60 

 50 

 W 

 30 

 20 



Bi 



11 



: 



i:; 



Fig. 10. Cod. Area XIX. 



Figure 9 is a curve of a different kind, showing the percentage (by weight) of "Cod" 

 in the total catch of Cod and CodHng for area XXIX. It will be observed that this 

 curve is a very smooth and regular one, the proportion of Cod being regularly at its 

 highest about the month of April, and at its lowest in or near the month of November. 



