PS I 



86 



.2 



4 .6 .8 i 1.2 1.4 2 2.6 



1 ■ i ' | i l i | I | i i | » " pr n 





c\ \g 

 \X\\ ; 



100 



200 



COHESION, g/cm 2 



FIGURE 12. RELATION OF POROSITY TO LOGARITHM OF COHESION 



BY AREA AVERAGE. CORRELATION LINES FROM FIGURE 11 ARE 



SHOWN SUPERIMPOSED TO INDICATE DIFFERENT SLOPES 



3.9 



