MIGRATION. 85 



place ; for example, the size of the herrings caught off the 

 projecting coast of Stadtland in Norway is much larger 

 than the size of those caught on the west coast of Shet- 

 land; which kind, again, is nearly twice as large as the 

 first-caught Thurso herrings ; and these are smaller than 

 the Isle of Man, Minch, and Loch Fyne herrings, smaller 

 than the Caithness and Banff herrings, and much smaller 

 than the herrings caught off Aberdeenshire, Fifeshire, and 

 Berwickshire. Again, the Yarmouth herrings are smaller 

 than those of Aberdeenshire and Berwickshire, and in the 

 West Highland lochs the size of the herrings in such 

 loch is distinctly seen and known ; for instance, in some 

 of the Highland lochs, for years, large quantities have 

 been caught, uniformly of the size of the tenth class, while 

 in other lochs the size is uniformly of the seventh or 

 eighth class. 



A size of herrings similar to those of Yarmouth till 

 lately visited Liimfiord in Denmark, and still visits the 

 coasts of that country. Now, on the Mecklenburg coast 

 in the Baltic, the size of the herrings is larger than 

 those of Denmark ; and proceeding up the Baltic coast 

 above Mecklenburg, namely, on the Pomeranian and part 

 of the Prussian coasts, the herrings are fully one-third 

 smaller ; and again, still farther up, they are larger, and 

 about the size of the Moray Frith herrings. Thus those 

 who argue that the herrings come from the north must 

 furnish two kinds of herrings, — namely, one kind which, 

 in its progress, grows smaller on its journey, and another 

 which grows larger. Even in the English Channel the 

 varieties may be easily distinguished in the neighbouring 

 localities ; for instance. Professor Valenciennes in his 

 edition of Cuvier's " Natural History of Fishes," says, " It 

 is not difficult, with a little practice, to discover the dif- 



