OUACHITA COUNTY. 141 
The following is an analysis of a sample of material said to have 
come from "Red Hill," made in 1882 for Walter Hamilton, of 
120 William street, New York„City, by A. Guyard, chemist. The 
material seems to be the same as that found in the Sandy Branch 
exposure. 
Analysis of kaolin from, Red Hill. 
Silica (Si0 2 ) 70.40 
Alumina (A1 2 3 ) 18. 40 
Peroxide of iron (Fe 2 3 ) 1. 25 
Titanic acid (Ti0 2 ) 05 
Manganese (MnO) Trace. 
Lime (CaO) 55 
Magnesia (MgO) 25 
Alkalies Trace. 
Sulphuric acid (H 2 S0 4 ) 25 
Water (H 2 0) 8. 75 
Loss 10 
100. 00 
A sample collected by the State Geological Survey of Arkansas 
(through Arthur Winslow, assistant geologist) at the Sandy Branch 
locality was analyzed by the Arkansas Survey. The label with this 
specimen says it comes from the NW. \ SW. \ sec. 2, T. 12 S., R. 18 W. 
Whether it came from that locality or from the one on Sandy Branch, 
the material is the same. 
Analysis of kaolin from sec. 2, T. 12 S., R. IS W. 
[Brackett & Smith, analysts.] 
Silica (Si0 2 ) 76.21 
Alumina (A1 2 3 ) 1(5. 00 
Ferric oxide (Fe 2 3 ) 75 
Lime (CaO) Slight trace. 
Manganese and alkalies (by difference) 1 . 06 
Water on ignition (H 2 0) 5. 98 
100. 00 
Anyone examining this material is impressed by the fact that it 
contains a large percentage of sand, though, of course, samples can 
be selected that are comparatively free from sand. In order to 
determine the nature of the material when freed from the greater 
part of the coarse sand, a sample of it was washed. The following is 
the analysis of a sample of the washed material, the sand being 
deducted from the silica and the composition recalculated: 
Analysis of washed kaolin from sec. 2, T. 12 S., R. IS W. 
Silica (Si0 2 ) 28. 47 
Alumina (A1 2 3 ) 48. 00 
Ferric oxide (Fe 2 3 ) 2. 25 
Magnesia (MgO)..) 3 lg 
Alkalies J 
Water (H 2 0) 17. 84 
99.84 
