33 



reference to other schools as well as those considered. Another 

 point has emerged from the diagrams with regard to the dabs of 

 the Forth region, viz., that they evidently enter the region in either 

 two schools or by the splitting of one school so as to reach the south 

 side of the Forth and St. Andrews Bay. It will be found later 

 that the latter explanation. is the more probable one. It might be 

 said also that apparently the migrants arrive earUer and depart 

 later m the Forth school than in that of Northumberland. And it 

 ought also to be stated that while there is a remarkable similarity 

 year after year as to the period of the migration it varies with 

 regard to time and intensity. 



3 — The Sizes of the Migrants. 



Passing now to consider the migrations with reference to size, 

 the following table prepared from Mcintosh's * summary tables 

 of the " Garland " experiments may first be presented. It gives 

 the average results per haul for the years 1886-95. 



TABLE II. 



St. Andrews Bay. 



Plaice. 



* Resources of the Sea. 



