3 88 



G. G. SCOTT. 



different lots are great enough to ascribe any importance to them 

 and thus say that they are due to difference in degree of injury 

 or on the other hand whether after all they are not simply chance 

 discrepancies. Workers in statistical method have deduced the 

 law that if the mean difference of one character in any two series of 

 forms is less than the probable errors of the difference then the 



TABLE I. 



Lot A. 



Lot B. 



Lot C. 



