Fig. 27. 



Fig. 28. 



Fig. 27 — Terraced valley slopes at Huaynaeotas, Cotahuasi Valley, Peru. Eleva- 

 tion 11,500 feet (3,500 m.). 



Fig. 28 — The highly cultivated and thoroughly terraced floor of the Ollantaytambo 

 Valley at Ollantaytambo. This is a tributary of the Urubamba; elevation, 11,000 feet. 



