LANDINGS AT ENGLISH POETS, 19()r)-2() 207 



The warning must be repeated that the figures of the inckisive 

 catches from all grounds are by themselves unsafe guides for 

 the student of the vital statistics of the fish population. He 

 must study the fluctuations on each of the grounds separately, 

 and check the gross landings from the tables which indicate the 

 yield per vessel per day's absence from port. Not infrequently 

 he will find that the variations in the weight of fish landed may 

 fairl}^ be ascribed to the growth or diminution in the number of 

 vessels which visited the grounds in a particular year. The 

 writer has reduced the tables for individual fishing grounds, and 

 the comparative statements of daily catch per vessel of the 

 staple species, to graphs. They give no convincing indication 

 that restrictions on fishing during the war have resulted in any 

 great accumulation of fish in the north-eastern Atlantic, and it 

 seems highly probable that the annual fluctuations in the exploit- 

 able stock are due, primarily at any rate, to causes altogether 

 outside the control of man. But the examination of post-war 

 conditions is outside the scope of this work, and this appendix 

 is added only to show the lines along which the explorers of the 

 sea bottom are likely to work in the immediate future. 



APPENDIX ITl 



Measurement of Fish, Eij(fs (by H. von Bayer's Table) 



Solids increase as the third j>oicer of their diameter.'^. 

 Example : d =0-127" diameter of white fish egg (determined). 



n =33,036 number of white fish eggs per quart (actually counted), 

 di =0-1406" diameter of shad egg (determined), 

 n, =nimiber of shad eggs per quart (sought). 



d^n 

 d^ : d,3 = n, :n .-. n, = ^ or 01273 : 0-1406^ = n^ : 33,0.36 



0-1273 X 33,036 ^,^,,, 

 ^^ ^ 0-1406^ — " ^ 24,345 (answer) 



