118 MAGNETISM. 



on the top of the magnet, and taking hold of 

 the handle it will adhere sufficiently strongly to 

 allow itself to be lifted up, so wonderful is its 

 power of attraction. If you take a needle, and 

 just draw one of its ends along one extremity 

 of the magnet, and then draw the other end 

 along the other extremity, and then gently place 

 it on the surface of some water (the needle will 

 generally float on the surface, owing to the 

 slight greasiness communicated to it by the 

 fingers) you will be able to get all the pheno- 

 mena of attraction and repulsion, by bringing 

 another magnetised needle near to it. 



I want you now to observe that although I 

 have shown you in these magnets that this 

 double power becomes evident principally at the 

 extremities, yet the whole of the magnet is con- 

 cerned in giving the power. That will at first 

 seem rather strange ; and I must therefore show 

 you an experiment to prove that this is not an 



Fig. 40. 



accidental matter, but that the whole of the 

 mass is really concerned in this force, just as in. 



