86 



number of typical Pfeiffer's bacilli + the number of atypical 

 Pfeiffer's bacilli — the total number of Pfeiffer's bacilli. Finally 

 the percentage of positive findings is given in parenthesis together 



■> N> Co "^- <n 



with its mean error. With 

 soldiers the mean error is 



P°/o 

 ]/ P < 10 



positive findings among n 

 In this calcula- 



P) 



0/0. 



tion there is the assumption that the choice of the persons 

 examined is fortuitous". This requirement must be fulfilled 



