58 
TRANSACTIONS OF THE TEXAS ACADEMY OF SCIENCE. 
59* 
Insoluble matter. 36.041 
Soluble silica. 17.255 
Potash. 1.308 
Soda.218 
Lime. 14.433 
Magnesia. 1.532 
Manganese.069 
Iron. 4.085 
Alumina. 9.114 
Phosphoric acid.. .204 
Sulphuric acid.041 
Carbonic acid. 9.912 
Water and organic. 6.008 
100.220 
* Cotton Production. Tenth Census, p. 45. 
Preliminary Classification. 
Based on the facts as given above, the following preliminary classifi¬ 
cation of Texas soils is offered: 
COASTAL SLOPE. 
Coast Prairies: 
Residual.} 
Transported. V Sands, gray silts, black waxy. 
Alluvial .) 
Tertiary Belt: 
Residual. 
Reynosa.Brown sandy, black loam, black waxy. 
Oakville.Sandy loams and marls. 
Frio.Black sticky to black waxy. 
Fayette.Gray sands or sandy loams. 
Yegua.Dark clay loams to light sands. 
Marine.Red and gray sand and red clay, mulatto or 
dark sandy loams. 
Lignitic.Gray sands and sandy loams, black shelly, etc. 
Transported. 
Drift.Sandy loams. 
Alluvial.Loams, 
