60 INJURY, RECOVERY, AND DEATH 



the instant of transfer the following values : A = 2700, 

 M =90, ^=0.018, and K 2 =OMQ. As no more of A is 

 produced A diminishes and at the end of time T has the 



_ jr m 



value A T = AQe~ During exposure to NaCl a cer- 



tain amount of M is formed from A. Some of this dis- 

 appears during exposure. The amount which remains 

 at the time T may be called M r At the time T the 

 amount of M T which disappears in unit time is M T K 2 . 

 At this time the amount of M produced in unit time is 



The change in M T occurring in unit time, which we may 

 call ~~ f is equal to the difference between the amount 



formed and the amount decomposed, or 



K-\T 



, Y *r TT 



-- A Q e KI- M T K 2 



The solution of this equation is of the form 



. K T - T\ T 



M T = A, (ae " l + be A *' ) 



jr 



By substitution it is found that a = 



A2 



Since M = o when T = o, b= 

 T 



Thus 



or 



We must also consider that at the beginning of the 

 exposure to NaCl 0.52 M there was present a certain 



