"A previous publication reported the occurrence of in the eyes of all rats fed on rations containing as the chief source of . Negative results with other carbohydrates tested led to an investigation of as the next logical step. This sugar was fed to young rats at 35% and 25% levels corresponding to the galactose available from the 70% and 50% lactose rations fed in previous experiments. Four rats on the 35% galactose ration developed mature bilateral cataract in 12, 14, 14, and 37 days respectively (average 19 days), whereas those on the 25% galactose ration were somewhat more delayed. The average time for the development of mature bilateral cataract in 49 rats fed the 70% lactose ration was 10 weeks, approximately 4 times as long. Controls fed on the 70% starch ration showed no eye changes."