THE MUTUAL AID SOCIETY OF THE SENSES. 641 



dren, at Waverly, Mass. " Here is one which is cheap, but limited 

 in its possibilities. It can only feed so many lights, or will only 

 give me so much horse power. Here is one larger, perhaps, but 

 not noticeably so, which is warranted to support ten times the 

 circuit, and to develop ten times the gauge of physical motive 

 energy. I examine them closely, and I find the difference of the 

 two to consist in the complexity of their coils of wire. The lesser 

 power dynamo, with fewer volts, has coarser coils and fewer of 

 them ; whereas the more powerful developer of energy consists 



Outline of Human Beain, Side View 

 Area of sight and its memories. 

 Area of hearing and its memories. 

 Area of motion and its memories, 

 Area of touch and its memories, 

 Area of motor speech-memories 



(After Ecker.) 



1. 

 2. 



3. 

 4. 

 5. 



The areas of motion and general sensation coincide to some extent. 



upper one third, leg. 

 middle one third, arm. 

 lower one third, face. 



of endless and delicate windings and layers of wire." The dif- 

 ference between the normal and idiotic brain is entirely one of 



complexity. 



The central nervous system consists practically of ingoing 

 fibers from the various organs of sense, and of nerve cells for re- 

 ceiving and retaining impressions conveyed by these fibers. By 

 some as yet unexplained power of co-ordination these cells com- 



TOL. xxyi. 48 



