186 MAGNETS. 



of A near the + end of B or C. Notice the repulsion, (c.) Bring 

 the end of A near the end of B or C. Notice the repulsion. 

 (d.) Bring the end of A near the + end of B or C. Notice the 

 attraction. (Fig. 121.) (e.) From experiment (a) we learned that 

 the ends of B and C were each attracted by the + end of A . 

 Bring the end of B near the end of C. Notice that they now 

 repel. (/.) From experiment (&) we learned that the + ends of B 

 and C were each repelled by the + end of A. Bring the + end of 

 B near the + end of (7. Notice that they now repel, (g.) In similar 

 manner show that the + end of B will attract the end of C; 

 that the end of B will attract the + end of C. (See Appendix I.) 



From these experiments we have a right to conclude that 

 every magnet has two dissimilar poles ; that like 

 poles repel each other , but that unlike poles attract 

 each other. 



Note. In all of these experiments we deal with a cause capable 

 of producing motion. Hence ( 64), magnetism is a force. 



3O7. Effect of Breaking a Magnet.// a 



magnet ~be broken, each piece becomes a magnet with 

 two poles and an equator of its own. . These pieces may be 

 repea'e:11y subdivided and each fragment will be a perfect 



FIG. 122. 



magnet. It is probable that every molecule has its poles, 

 or is polarized, and that, could one be isolated, it would 

 be a perfect magnet. "We thus conceive a magnet as made 

 up of molecules each of which is a magnet, the action of 

 the molar magnet being due to the combined action of all 

 the molecular magnets of which it is composed. 



3O8. Theory of Magnetism. For the explanation of the 

 phenomena that we have noticed, the existence of two magnetic 

 fluids has been imagined. The fluid whose resultant effects are 

 manifested at the + end of the magnet is called the positive fluid ; 



