;Contents: General Summary; Outline of Program; Summary of Acute Toxicity Data (Screening Tests) ( Acute toxicity of di isobutyl phthalate DIBP, Late deaths, Pathology, Acute toxicity of DBP, Late deaths, Pathology); Four Months Feeding Tests of Rats Given DIBP ( Growth, Mortality, Hematology, Organ Weights, Pathology, DIBP Summary); Four Months Feeding Tests of Rats Given Dibutyl Phthalate DBP ( Growth, Mortality, Hematalogy, Organ Weights, Pathology, DEP summary); Two Months Feeding Tests of Dogs Given DIBP ( Body weight, UrineAnalyses, Hematology, Organ weights, Pathology, Summary); Two Months Feeding Tests of Dogs Given DBP ( Bodyweight, Urine Analyses, Hematalogy, Organ weights, Pathology).