566 A. ('. LANE WEIGHT OF SEDIMENTARY ROCKS 



Moisture 2 .35 



Ignition loss 3.51 to 3. 61 3.50 



Per cent of H..O in midrietl clay direct from pit 24.61 



Sample C 



A B 



Per cini. Percent. 



Silica 62.07 62.04 



Ferric oxide 4.66 4.69 



Ferrous oxide 2.40 2.42 



Alumina 18.04 17. 98 



Titanium oxide 96 .97 



Lime 2 . 25 2 . 30 



Magnesia 3 . 46 3 . 47 



Soda 1.91 1.87 



Potash 4 . 29 4 . 28 



100.04 100.02 



Moisture 1.56 



Ignition loss 3 . 37 



Per cent of H,0 in undried clay direct from pit 18 . 47 



Sample D 



A B 

 Percent. Percent. 



Silica 56 . 73 56. 76 



Ferric oxide 7 . 39 7 . 40 



Ferrous oxide 3 . 40 3 . 42 



Alumina 18.57 18.55 



Titanium oxide 90 .89 



Lime 1.71 1.77 



Magnesia 3 . 25 3 . 22 



Soda 2 . 01 2 . 03 



Potash 6.06 6.03 



100.02 100.07 



Moisture 1.61 



Ignition loss 4 . 38 



Per cent of H 2 in undried clay direct from pit 19.68 



COMPAKATTVK DATA ON OTHER CLAYS 



A series of residual clays given me by Dr. E. S. Moore, of Pennsylvania 

 State College, gave comparable results as follows : 



