PACE 



Sheep ^29 



The wool dip -i^ 



Marketing wool in 1918 ^^ 



Cottonseed cake for dairy cows 330 



Instruction and executive work ■^^ 



Entomology ^^^ 



Zoology . ^^ 



Publications -^^ 



Chemistry • ^|^ 



Resistance of crops to alkali -^^ 



Miscellaneous Analyses ^5 



Tempe Drainage Ditch ^ 



Alkali studies ^46 



Date processing and marketing -> 34» 



Educational and Extension work 349 



Irrigation Investigations 351 



Status of irrigation water supplies 351 



An irrigation code 351 



Caisson wells 352 



Pump irrigation .••••: ,rf 



Cement pipe for irrigation pipe lines • 354 



Cement pipe failures 354 



Method of testing cement pipe 356 



Reinforcement for cement pipe 356 



Tractor power on farms 356 



ILI^USTRATIONS 



Fig. 1. Robert Humphrey Forbes Frontispiece 



Fig. 2. Cow peas— Salt River Valley Farm j^ 



Fig. 3. Club wheat and Early Baart wheat— Salt River Valley Farm 29^ 



Fig. 4. Papago sweet corn— Prescott Dry-farm 294 



Fig. 5. Crack in 20-inch pipe line 353 



Fig. 6. A cracked gate-pit -^^^ 



