The site of localization and concentration of ascorbic acid (AA) in a number of tissues of the pigeon were studied by a modified histochemical method coupled with cytophotoelectrometric determinations. It was evident from the data that significant variations were found in AA concentrations of different tissues of the pigeon. The brain possessed the highest content of AA/cell. The liver, ovary, pancreatic acini, kidney, adrenal and testis followed in order, whereas, the pancreatic islet region was the poorest in AA. On the basis of the synchronization of the high AA content of these tissues with their well known high level of metabolic activity, it is suggested that AA participates in the metabolic turnover by serving as an electron donor via the formation of its free radical. Considering the fact that these organs are very rich in ascorbic acid, there is also a possibility for the biosynthesis of AA in tissues like the liver and kidney of the pigeon as in other bird species. The need for further work in this direction is stressed.