4 DR ARTHUR T. MASTERMAN ON THE 



inclined to reservedly ascribe a great deal of it to the destructive agencies at work 

 amongst the early cod, which we know must take place as a deduction from the high 

 fecundity.* 



The midwater curve in Table II. commences with a solitary specimen or two in 

 the early 4 and 5 mm. stages, and steadily increases till a length of 9 mm. is 



180 

 no 

 160 

 ISO 

 I -to 

 '30 

 120 

 110 

 100 

 90 

 SO 



10 



I 



,60 



j-50 

 n 



c 

 \20 



10 



zz. 



c 

 3 



Table II. 



Cod. 





































































N 























\ 























\ 























\ 























\ 























\ 

























\s. 























\ 

 1 

 — t 



1 

 1 

 1 























1 

 — t 



1 

 — 1 — . 



1 



1 



M. 





















' •••• 



1 .• 























V 

























\ 





















: \ 























:' \ 























\ 























> 



• 





















\ 











L. 













\ 























< 























^JL 



\ 

 \ 



■•. 

















^/ 





x 



^^ 





..••••. 











i 



/J 20 25 30 



— Length s in mmz 

 Surface Midwater 



35 



Bottom 



4-0 



4-5 SO 



.Littoral 



55 



reached. From this point to the stage represented by a length of 24 mm., there is- 

 a gradual but very steady decrease in the number per haul, a decrease closely parallel 

 to that of the surface curve. After 24 mm., from whatever cause, with the excep- 

 tion of an occasional isolated specimen at 33 and 38 mm., no more young cod appear 

 in the midwater. 



From about 22 mm. onwards there appears the littoral curve. At this size the 



* Natural Science, 1896. 



