RAPPORTS. XIV: THOMPSON 



12 — 



per sq. m., a series of simple concentric ovals, focussed in the Dogger Bank, and almost 

 precisely similar to those shown for the aggregate catch of all fishes. In the case of 

 Haddock the Dogger Bank leads the way with 38 cwt. to the sq. m. ; a central zone of 

 50 cwts. per sq. m. and over, which figured in the chart for 1906 — 07, has now dis- 

 appeared. In the case of Cod the highest is again on the Dogger, with 17 cwts., and 

 here again a maximal zone of 20 cwts. and over has no place in the chart. 



In the case of Ling (fig. 15) the highest mean catch per sq. m. is on area Dl (6 

 cwts.) but is nearly approached by the adjacent region of the Dogger, which yields just 



Fig. 15. Catch of Ling (in cwts.) per square mile of area; English 

 Steam Trawlers, 1906 — 10. 



Fig. 16. Catch of Saithe (in cwts.) per square mile of area; English 

 Steam Trawlers, 1906 — 10. 



over y, cwt. per sq. m. In this case, and also in the case of Saithe (fig. 16), owing to 

 the great natural increase in abundance of these fishes as we pass northward, our curves 

 of quantities per sq. m. tend to open out to the northward, while on the other hand the 

 gradient falls very rapidly towards the south. 



In the case of Whiting (fig. 17) the quantities per sq. m. are greatest on C2 and 

 next greatest on the Dogger (Bl) to the west thereof. But in this case it is to the west- 

 ward, that is to say towards the English coast, that the curves open out,' and it is from 

 the north, south and east that the smallest takes per sq. m. actually come. 



I am not sure that the minor details of these maps are of very great or striking interest, 

 but on the whole, I think it is of very considerable interest to see how important, both 



