No. 527] SHORTER ARTICLES AND DISCUSSION 



found them a great service, and since I have never seen them 

 use 15 by other calculators it seems worth while to direct attenti 

 to them. 



J. Arthur Harris 



Cold Spring Harbor, L. I., 

 August 27. 



,e In some respects Hardy's summation method described in detail 

 Elderton in "Frequency Curves and Correlation" is similar, but I beli 



