ANIMAL AND VEGETABLE 101 



In plain muscle the figures given are 0-045 to 0-225 mm. 

 long by 0-004 to 0-007 mm. wide. These are given by 

 Hopf. Halliburton states that the fibres of voluntary 

 muscle average about 1 in. in length and ^Jo (0-05 mm.) 

 in diameter. 



To TEST THE BODY FOR CAPACITY. 



There are several ways of doing this, but as extreme 

 accuracy is not required, the most convenient method is by 

 direct discharge. For this a " universal " shunt and a 

 standard condenser of & to 1 micro are required, and the 

 subject should stand upon an ebonite slab to obtain good 

 insulation. 



Using fairly high power (say 20 volts) at first, and 

 afterwards not more than 0-5 volt, take two sets of observa- 

 tions in the following manner. Charge the standard 

 condenser F x by the battery for a given number of seconds 

 and discharge it through a shunted galvanometer. Note 

 the immediate deflection and call it d v . Next, charge the 

 condenser to be measured (the body), F 2 , by the same 

 battery ; discharge it through the galvanometer and again 

 note the immediate deflection, d a - Then 



FxrFj,::^:^, or F 2 = F^ 



F 



If -~ is made a submultiple of 10, d 2 gives the capacity at 



once. 



The multiplying power of the shunt or shunts used is 

 found by the formula 



G being the resistance of the galvanometer in ohms, and 

 s the resistance of the shunt. 



