Excerpted from page 193 of Volume XIII of the Experiment Station Record: This bulletin discusses the climatic, soil, and other conditions as affecting irrigation in Hawaii, and gives the results of irrigation experiments, especially with sugar cane, carried on in the islands by the author for a number of years. It deals with evaporation of moisture from water surfaces and soils, transpiration of moisture by vegetation, power of soils to absorb and retain moisture, salts in Hawaiian soils and waters, duty of water, irrigation practice on the Hawaiian Islands, and study of irrigation at the Hawaiian Experiment Station, including observations on distribution of water and results of overirrigation.