Abstract
Exocrine cells of the pancreas of male rats bearing the Walker carcinoma show a striking accumulation of stainable neutral lipid in the form of small aggregated droplets in the base of the cells. In several cases, epithelial cells of small ducts also contained fat. Stainable lipid is sometimes present in cells of the pancreas of normal rats and in rats in which the Walker tumour has failed to grow: lipid in duct cells was confined to tumour-bearing animals.