— 186 



Form of density: Middle. 



I. Quality. 



9.7514 

 %G = 3.3032-^-^ - 



22.4536 



i.e. =G2010e 



t 



m=±6.3% 

 r=±5.5% 



Diff.>r II in number 

 Diff.<r 12 in number 



II. Quality. 



12.5002 

 Zo^G = 3.2337- — ^- - 



_ ^87830_ 

 i.e. G=1710e * 



m = ± 7.0^ 

 r = i4.7% 



Diff.>r 9 in number 

 Diff.<r 8 in number 



III. Quality. 



15.7346 



t 

 36.2305 



rG=3.1933- 



j. e. G = 1561e 



m=±2.6% 

 r=±1.8% 



Diff. >r 2 in nximber 

 Diff.<r 1 in number 



