DIAGRAM TO ILLUSTRATE THE PART WHICH THE 

 ETHER TLAYS IN NERVOUS ACTION. 



a, h, Marconi's wireless telegraph poles ; c, the ether i:i a state of 

 tension ; d, a nerve-cell permeated by the ether, which undergoes 

 variations of tension as the molecules of the cell move hither and 

 thither as a result of oxidation in part of the cell ; e, a nerve fibre ; 

 XXX, a stratum of ether, variations in the tension of which, 

 caused by molecular movements in the fibre, give rise to the 

 current of action ; /, a muscle also permeated by the ether, varia- 

 tions in the tension of which help to convey the nerve impulse to 

 the molecules of the tissue. 



To face p. 45. 



