APPENDIX. 



The following table shows the extent of the Houston black clay in the areas sur- 

 veyed to this time. In the first column is stated the particular survey in which the 

 soil was encountered; in the second column its extent in acres; and in the third column 

 the volume of the Field Operations of the Bureau of Soils in which the report upon 

 the area may be found. Those desiring a detailed description of the soil and of the 

 general conditions which surround it in any particular area may consult these vol- 

 umes in almost any public library. 



Areas of the Houston black clay encountered in the soil survey. 



' Year of publication. Field Operations. 

 * Mapped as Houston clay. 



14 



Mapped as San Jacinto clay. 



o 



