Abstract
A condition is described in guinea-pigs which manifested itself by intussusception of the small intestine in 49 out of 77 fatal cases. Proliferation of the bile ducts and centrilobular fatty degeneration of the liver cells found on histological examination induced us to suspect aflatoxicosis. Toxicological analysis of the lucerne hay fed to the animals corroborated this hypothesis. An organic phosphorous insecticide was also found in the hay.