LIST OF ILLUSTRATIONS. 



Plate 1. 



Facing page 

 Map of the Urubamba region of Peru 1 



Plate 2. 



Upper: Headwaters of the Urubamba River at La Raya Pass. 



Lower: Occobamba Pass 14 



Plate 3. 

 Upper: Camp at Ttica-Ttica. 

 Lower: Huaracondo River and (in the distance) town 16 



Plate 4. 



Upper: Huaracondo Canyon at its entrance to the Urubamba Canyon. 

 Lower: Looking down the Urubamba River, toward Mount Salcantay, at 

 Ollantaytambo 17 



Plate 5. 



Upper: Camp at Astillero below Torontoy. 



Lower: Urubamba River above Santa Ana 19 



Plate 6. 

 Forest in bottom of the Urubamba Canyon above San Miguel Bridge 20 



Plate 7. 

 Forests of the Subtropical Zone in the Urubamba Canyon at Machu Picchu. . . 21 



Plate 8. 



Upper: Timberline near Cedrobamba. 



Lower: Forests near Cedrobamba 22 



Plate 9. 



Upper: Chauillay Bridge over the Urubamba River. 



Lower: Santa Ana Valley, Lov/er Urubamba Valley 23 



6 



