ILLUSTRATIONS 



1. a, Butte Ruin, b, Aztec Spring Ruin, c, Surouaro, Yellow Jacket Spring Ruin. 



2. a, Blanchard Ruin, b, Blanchard Ruin, Mound 2. c, Surouaro, Yellow Jacket 



Spring Ruin. 



3. a, Acmen Ruin, b, Mud Spring Ruin. 



4. a, Building on rock pinnacle, near Stone Arch, Sand Canyon, b, Stone Arch, 



Sand Canyon. 



5. a, Tower in Sand Canyon, b, Unit-type House in Sand Canyon. 



6. a, Stone Arch House, Sand Canyon. 6, Cliff-house, showing broken corner. 



7. a, Scaffold in Sand Canyon, b, Storage cist in Mancos Valley, c, Pictographs 



near Unit-type House in cave. 



8. Double cliff-dwelling, Sand Canyon. 



9. a, Cliff -dwelling under Horseshoe Ruin, b, Cliff-dwelling, Ruin Canyon. 



10. a, Kiva of cliff ruin, Lost Canyon, b, Cliff ruin, Lost Canyon. 



11. a, Square Tower in Square Tower Canyon, b, Tower in McLean Basin, c , Ruin 



in Hill Canyon, Utah. 



12. Head of South Fork, Square Tower Canyon. 



13. North Fork of Square Tower Canyon, looking west. 



14. a, Hovenweep House and Hovenweep Castle, from the south, b, Hovenweep 



Castle, from the west, c, Hovenweep Castle, from the south. 



15. a, West end of Twin Tower, showing small cliff-house, b, Twin Towers, Square 



Tower Canyon, from the south, c, Tower 4, junction of North and South 

 Forks, Square Tower Canyon. 



16. «, Hovenweep Castle, with Sleeping Ute Mountain, South Fork, Square Tower 



Canyon, b, Entrance to South Fork, Square Tower Canyon. 



17. Stronghold House, Square Tower Canyon. 



18. a, Head of Holly Canyon, b, South side of Hovenweep Castle, Square Tower 



Canyon. 



19. a, Holly Canyon group, from the east, b, Great House at head of Holly Can- 



yon, from the north, c, Unit-type Ruin, from the east. 



20. a, Great House at head of Holly Canyon, from the south, b, Ruin B at head 



of Holly Canyon, from the west, c, Great House at head of Holly Canyon. 



21. a, Great House, Holly Canyon, b, Stronghold House and Twin Towers, Square 



Tower Canyon. 



22. a, Hovenweep Castle. 6, Southern part of Cannonball Ruin, McElmo Canyon. 



23. a, Square tower with rounded corners, Holly Canyon, b, Holly Tower in Holly 



Canyon, c, Horseshoe House. 



24. a, Horseshoe Ruin, b, Bowlder Castle, Road (Wickyup) Canyon. 



25. a, Closed doorway in Bowlder Castle, Road (Wickyup) Canyon, b, Broken- 



down round tower, Square Tower Canyon. 



26. a, North side of tower, Square Tower Canyon, b, D-shaped tower near Davis 



ranch, Yellow Jacket Canyon, c, Model of towers in McLean Basin. 



27. Round tower and D-shaped tower in McLean Basin. 



28. a, D-shaped tower in McLean Basin, showing cross section of wall, b. Round 



tower in McLean Basin, showing standing stone slab. 



29. a, Holmes Tower, Mancos Canyon. 6, Lion Tower, Yellow Jacket Canyon. 



