Comparative Toxicities of Quercetin and Quercitrin**

Data are given on the toxicity of quercetin and quercitrin after intravenous administration in rabbits and rats after oral ingestion of diets containing as much as 1 per cent of quercetin or quercitrin for approximately 410 days. The results indicate a low order of toxicity as judged by growth, amount of food consumed, hematological findings, organ weights, and microscopical examination of stained section of visceral organs.