ERRATA. 



Page 51. TABLE III. 



For " profit " read " loss ". 

 For " loss " read " profit ". 

 Page 134. Lines 12 and 13. 



For " this value is (C' + ') - (C + E) in which (C' + ') repre- 

 sents " read " the original value of S v is C' C, in which C' represents ". 

 Last h'ne. 



For " (C' + ') " read " the item ". 

 Footnote. 



First line, for " the " read " an ". 

 Second line, for " endures " read " occurs ". 

 Third line, for the entire expression 



" (' - ) (i.op>> - i) instead of ' - E " read 



i.ojfi 

 Page 135. 



First line, 



for " (C +)" read "C'-C 

 Formula Q?. Change to read 



- (S* + E)+ (C - C). 



Page 157. Formula Ilia. 



Instead of " (E-i.o/* 20 - + ') i.o^ 10 - E" + E'" etc." read 

 " (E-i.o/> 2 -+') i.o/^ - E' + E" etc." 



Page 247. For formula Oa read 



