Manchester Memoirs, Vol. Lx. (igi6), No. ft. 21 



Indians" it is said that irrigation is found in the south- 

 west States on the Rio Grande and its tributaries. Irri- 

 gation canals, dams and reservoirs are found in the valleys 

 of the Gila and its tributaries in South Arizona. 08 The 

 Pima Indians of the Gila river irrigate by means of con- 

 duits and ditches leading from the river into reservoirs. 69 

 The same author states that traces of ancient irrigating 

 canals and ditches are to be found in New Mexico.'" In 

 Arizona, especially in the Gila bottom, irrigation is found. 

 The Moqui Indians on the Rio Grande had reservoirs 

 lined with masonry, " the face of the cliff had been ingeni- 

 ously converted into terraces. These were faced with 

 neat masonry, and contained gardens, each surrounded 

 with a raised edge so as to retain water upon the surface. 

 Pipes for the reservoirs permitted them at any time to be 



irrigated A long flight of stone steps, with sharp 



turns that could easily be defended, was built into the 

 face of the precipice, and led from the upper reservoir to 

 the foot of the town." 71 Again it is said that " The walls 

 of the terraces and reservoirs were of partially dressed 

 stone, well and strongly built, and the irrigating pipes 

 conveniently arranged." 7 '- Fewkes says in one place, 

 " Students of South-western Archaeology are familiar 

 with rows of stones marking off the surface of the land in 

 rectangles of great regularity. Some of these lines of 

 stones extend for several hundred feet. Similar sites are 

 found in the San Simon valley. " They may be regarded 

 as the walls of terraced gardens, so placed as to divide 

 different patches of cultivated soil, and to prevent this 

 soil from being washed down to the plain below. " Very 



,is Op. cit., I., p. 619 — et seq. 

 r, ' J Bancroft, I., p. 539. 



70 Bancroft, IV., p. 619. 



71 Bancroft, IV., p. 668. 



72 Ibid, p. 670. 



