90 MIGRATION. 



our own coasts and the coasts of other countries, it is 

 reasonable to conclude that it inhabits the seas in the 

 neighbourhood of the coasts on which it spawns, and that 

 it arrives at particular seasons near the coasts for the 

 purpose of spawning, the shoals leaving the coasts im- 

 mediately thereafter ; and the early or late, and distant 

 and near, approach to the coasts in different years, per- 

 haps depends, as before remarked, on the clear and warm, 

 and dark and cold, weather of the season, as well as upon 

 the depth of water at the feeding and spawning grounds. 



