Photograph by O. F. Cook 



FARMING AT AN AXGLE OF 45 DEGREES 



A slope in the valley of Ollantaytambo, with an angle of about 45 degrees, or steeper than 

 the roofs of most houses, is covered with transverse ridges, showing that the entire surface 

 was cultivated in former times. Parts of the same slope farther to the left are still cultivated. 

 The structures in the foreground are ancient graves or storehouses, perched on a large rock, 

 seen from a ruined town called Pumamarca. 



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