APPENDIX. 



The following table shows the extent of the Houston clay in the areas surveyed 

 to this time. 



In the first column is stated the particular soil survey in which the soil was encoun- 

 tered; in the second column its extent of development 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 

 volumes in almost any public library. 



Areas of Houston clay encountered in the soil survey. 



i Year of publication, Field Operations. 

 * Mapped as Houston black clay. 

 8 Mapped as Austin clay. 



o 



11 



