78 EDUARD UHLENHUTH. 



Mr. Johnson informed me soon after my arrival in San Marcos 

 that the blind white salamander has been seen in his well, and in 

 fact this well has yielded us more salamanders than any other 

 place. It is shown in Fig. 3. 



The well is located in the valley of Purgatory Creek, a short 

 distance above where the creek enters the plain. Part of the flat 

 valley is visible in the figure. Near the well is a sink hole (Dris- 

 kel's Water Hole, see diagram, Fig. 4). The well was dug from 



FIG. 3. Frank Johnson's Well. Showing the well house and at the right of 

 the well house the dry and flat valley of the Purgatory Creek. 



a level of 613 feet 1 above sea (San Marcos Court House 620 

 feet) to a depth of 317^ feet. There a cave was struck which 

 now communicates with the well through a slit in the well bot- 

 tom, as indicated in the diagram (Fig. 4). From this slit the 

 water rose to from 3 to 5 feet in the well. This makes the sur- 



1 Altitudes above sea level were measured by means of an anaeroid barome- 

 ter and therefore are only approximately correct (within several feet). Di- 

 mensions other than altitudes were measured directly, except when otherwise 

 stated. 



