INTRODUCTION 



figures with observed ones is of a greater use and 

 clearness. 



But we can proceed more simply by putting 

 y = log Zj i.e. plotting log z as a function of A in 

 which case we get a straight line (the continuous 

 line in Fig. 2), beginning at the point jo = log Z Q = 

 log 1 00= 2 and cutting the /-axis in the point log z 



100 



80 



t- 



z 



60 



40 



20 



\ 



\ 



20 



16 



I 



Log z 

 12 



08 



04 



I 2 t ^ 3 4 5 6 



FIG. 2. 



= o, i.e. z= i, and 2 o = ^/ , i.e. / =2/^ (in Fig. 2 

 / = 20-6, 4 lies so far to the right that it does not 

 appear in the figure). Here the value of b is 

 very simple, namely, <5 = 2// , b is the so-called 

 velocity of reaction, it is equal to 2 divided by the 

 time in which the quantity of cane-sugar has sunk 

 to one per cent of its original value. Evidently 

 the shorter the time for decomposing 99 per cent 



