100 STUDIES IN ELECTRO-PHYSIOLOGY: 



both velocity of impulse and periodicity are dependent 

 upon the two factors of resistance and capacity. 



It is a pity that we have no data as to the specific 

 inductive capacities of the natural dielectrics of the body, 

 such as cholesterol, neuro-keratin, lecithin, kephalin, the 

 medullary sheath, etc., as a basis for calculation. As 

 against the 1 of air, sulphur is 1-93, but as other dielectric 

 substances range between 1-77 and 10-1, it is evident that 

 further research is called for to determine this important 

 point. 



Apart from, but in addition to, specific inductive 

 capacities, I should much like to have the following 

 information : 



In a selected piece of striated muscle 



(1) The surface area of the clear spaces, 



(2) The thickness of Krause's membrane, 



(3) The average number of sarcomeres connected by 



the end-plates of motor-nerve fibres, and 



(4) Whether such end-plates do or do not connect the 



clear spaces thus 



endplatef 



Fig. 11. 



That would be something to go on with. 



I learn from The Human Species, by Ludwig Hopf, 

 that an average size piece of striated muscular fibre measures 

 20-4 mm. in length by 0-06 mm. diameter. If we had the 

 thickness and specific inductive capacity of Krause's 

 membranes we could, at least approximately, calculate the 

 capacity of each sarcomere. 



