COLOTTE, FORM, AND MOVEMENT. 75 



from the spawning place. If this be the case, then the eels 

 have inherited the double instinct of returning to their 

 ancestral home to spawn and die, and what must be re- 

 garded as the more remarkable one of the young elvers, of 

 finding their way to the fresh waters many hundreds of 

 miles away along a route of which they have no previous 

 knowledge. 



It will be well also to refer to the migrations of the 

 salmon, which are exactly opposite in character, since the 

 salmon frequent the fresh waters to spawn and return to 

 the sea, in which their principal growth takes place. 



Compare the journeys of migratory birds. 



By way of further development of the study of move- 

 ment the teacher should map out comparative studies on 

 the powers and modes of movement of some common 

 animals. Information which may be utilised in this con- 

 nection will be found in the Chapters dealing with Birds, 

 Frogs and Toads, Moles and Bats, Snail, and Earthworm. 



