187 — 



Form of density: Dense. 



I. Quality. II. Quality. 



f G =3.2399- 



j. e. G=1738e 



11.7212 



t 

 26.9892 



t 



m=±8.6% 



r =±5.7?^ 

 Diff.>r 8 in number 

 Diff.<'' 14 in number 



' G =3.1430-- 



.7262 



27.0007 



z. e. G = 1390e 



m=±4.6% 



r =±3S)% 

 Diflf. >r 3 in number 

 Diff.<r 4 in number 



III. Quality. 



17.8813 



' G = 3.2264 - 



i.e. G = 1685e 



41.1735 



Age. Obs. ; Cal. 



Diff. 

 % 



28 

 30 

 33 

 34 



357 

 466 

 517 

 461 



387 - 8.4 



427 I + 8.4 



484' + 6.4 



502 - 8.9 



r = ± 1.6% 



Diff.>r 3 in number 

 Diff.<r 1 in number 



