118 



ROGERS AND McLÉOD ON THE 



Table I. — Weight Factors. 



— 30 



— 25 



— 20 



— 10 





 + 10 

 + 20 

 + 30 

 + 10 

 + 15 

 + 50 

 + 5.5 



+ 60 

 -1-62 

 + 61 

 + 66 

 + (S 

 + 'n 

 + 72 

 -1-71 

 + 75 

 -1-76 

 + 77 

 + 78 



Mont- 

 real. 



Cam- 

 bridge. 



0.82 

 0.80 

 0.78 

 0.7Ô 

 071 

 0.6(3 

 0.61 

 0..56 

 0.53 



0..TO 



47 

 0.41 



0.82 

 0.80 

 0.77 

 0.74 

 0.70 

 0.6.5 

 0.60 

 0-.55 

 .52 

 49 

 46 

 43 



Table II. — Level Corrections. 



