380 



PHYSIOLOGICAL. REGULATIONS 



incommensurate. Wherever commensurate, it is feasible to com- 

 pare quotients at the numerically same load. Frequently the 

 quotient happens to change but little (less than twice) throughout 

 the range of loads investigated (fig. 181). Often a sharp shift in 

 the value of h occurs at Cq. When the range of loads is limited 

 to either positive ones or negative ones, no trends greater than a 

 factor of 10 are actually found in net quotients. 



The reciprocal of velocity quotient has the dimensions of resis- 

 tance, for the load may be classed as a potential and the rate as a 

 flow. When h is constant with load, then, it appears that there 

 is no greater resistance to the exchanges under large loads than 

 under small loads. As for other parameters, the term resistance 

 as here used may have little except its dimensions in common with 

 the term as used in other sciences. 



TABLE 42 



Initial rates of recovery in dog. Velocity quotient, Jc^, = 1/hour - 

 0. 6 9S /half -life in hours 



If velocity quotients are considered in relation to time, k is 

 constant whenever an exponential equation represents the data: 

 C = ae'^K In such instances the rate of exchange is at all times 

 proportional to load (E/AC = A;). When k is not constant 

 with time, values are compared within some particular interval. 

 This may or may not be a clock interval ; it is possible to compare 

 k in the first half of each recovery, or first 1/eth, or first 1/lOth. 



