ILLUSTRATIONS. 
Pago. 
Plate I. Geological map of a portion of the Gulf Coastal Plain 14 
II. Generalized section of the Texas-Louisiana Gulf Coastal Plain for- 
formations 20 
III. Map of Spinclletop oil pool 68 
IV. View of a portion of Spinclletop, 1902 72 
V. Index map showing location of Louisiana oil districts _ _ ._. 128 
VI. Sand gusher at Welsh, La 136 
VII. Map of petroleum fields 144 
VIII. A, Williams burner, section through center of burner; B, Wil- 
liams burner, horizontal section through center of burner 162 
IX. Babbitt syndicate earthen oil reservoir 164 
X. .4, Chapman rotary drill; B, Hoisting and operating machinery, 166 
XL A, Fish-tail bit; B, Core-barrel bit; C, Adamantine or shot drill. 168 
Fig. 1 . Sketch contour map of Damon Mound .. 36 
2. Sections of Spindletop oil pool . 73 
3. Map of region surrounding the Spindletop oil pool 86 
4. Map of Sabine Pass, showing location of so-called oil ponds 105 
5. Index map showing location of Sour Lake and Saratoga oil pools 114 
6. Map of Sour Lake district 115 
7. Sketch contour map of High Island 123 
8. Map of Jennings oil field 128 
9. Theoretical relations of gas, oil, and water in the reservoir rock . . 157 
10. Boiler furnace with oil-burning equipment ". 163 
11. Boiler furnace arranged for burning oil 164 
12. Derrick with machinery in place 168 
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