DISCOVERY REPORTS, VOL. IX 



PLATE X 



60° 



AB5ENT 

 UP TO 10% 



ll%-20% 



LIMIT OF OB5 N -5 



c^KVca 



-i ' ' ' ' ' i i i 



45 



50 



55 



65° 



60 c 



- 1 ' ' ' ' ' 1 - 



-\ I I I I I fH 



DISTRIBUTION OF MEDIUM SAND, 0-5-0-9 mm. 



