The Mason-bees 



paratus, magnetized or not, upon her back is 

 the same as expecting to study the natural 

 habits of a Dog after tying a kettle to his tail. 

 The experiment with the magnet is im- 

 practicable. What would it tell us if the in- 

 sect consented to it? In mxy opinion, it would 

 tell us nothing. In the matter of. the homing 

 instinct, a magnet would have no more influ- 

 ence than a bit of straw. 



xo8 



