790 



Case 



Total number of giant cells Relative cort. content 



Number 

 p. gram 



However, it is not quite admissible to adopt this middle-value without 

 further discussion, since the number of cases (10) is relatively small, 

 while the middle-value is known to be most exact if (he number 

 of examined cases is as large as possible. So for a determination of 

 the most accurate middle-value we have to take into account the 

 number of cases examined as well as the standard deviation, since 

 both are related with the mean error of the middle-value, as is 

 expressed by the formula m ==: a -. V n {m = mean error of the 

 middle-value, a = the standard deviation and n the number of 

 cases examined; [Johannsen]). So if n becomes very large o:[/n 

 will continually decrease, which means that then the absolute 

 middle-value Mn will continually approach the first calculated middle- 

 value Af, as the mean error becomes smaller. We find that here 

 this mean error is m„ = ± 4.56, the absolute middle-value becoming 

 Mn =24.111 ±4.56, thus ranging between 28,671 and 19,551. 



In the same way we proceeded with the deaf-mute cases. Here 

 A = 15 was taken as starting point, the average difference between 

 A and M^ found to be -f 0.963, Md working out at 15.963. The 



