LIST OF ILLUSTRATIONS 



The gray fox {Urocyon cinereoargenteus scottii) frontispiece 



Fig. 1 . Life zones of the Carlsbad Cavern region of New Mexico 



and Texas 9 



Fig. 2. Sketch map of Carlsbad Cavern with diagrammatic cross 



sections 10 



Fig. 3. West entrance to the Carlsbad Cavern 13 



Fig. 4. Inside room at west entrance to cave 14 



Fig. 5. The floor of the lowest room in the cave 23 



Fig. 6. The mesquite tree {Prosopis glandulosa) full of fruit... 24 



Fig. 7. The narrow-leaved yucca {Yucca radiosa) in fruit 35 



Fig. 8. The small mescal {Agave lechuguilla) in flower 36 



Fig. 9. Sotol plant with full grown flower stem fifteen feet 



high 36 



Fig. 10. The large mescal {Agave wislizeni) in flower 36 



Fig. 11. Old mescal pit where the Indians roasted agaves 41 



Fig. 12. A single well developed mescal or agave plant fit for 



roasting 41 



Fig. 13. Indian grinding-holes just in front of the Carlsbad 



Cavern 42 



Fig. 14. Indian grinding-holes just in front of the Carlsbad 



Cavern 42 



Fig. 15. An old bull buffalo charging the camera 51 



Fig. 16. A trio of mountain sheep in Yellowstone Park 52 



Fig. 17. Entrance to large cave in Slaughter Canyon not far from 



Carlsbad, New Mexico 52 



Fig. 18. Jack rabbit in open valley 63 



Fig. 19. Small cottontail {Sylvilagus auduboni minor) 63 



Fig. 20. A prairie-dog town in an alfalfa field 64 



Fig. 21. The prairie-dogs build mounds about their burrows. . . 64 



Fig. 22. The cave mouse {Peromyscus leucopus texensis) 71 



Fig. 23. The cliff mouse {Peromyscus boylii rowleyi) 71 



Fig. 24. Grasshopper mouse {Onychomys torridus torridus) 72 



Fig. 25. Texas cotton rat {Sigmodon hispidus texianus) 72 



Fig. 26. The white-throated wood rat {Neotoma albigula) 77 



Fig. 27. House of the gray wood rat {Neotoma micropus can- 



escens) 77 



xi 



