A Note on an Unusual Source of Contamination of Well Water

west coast stations in South Kanara district. The water from this well was found to be of very fair quality for either purpose at the time of its construction and for some time thereafter. During the last twelve months, however, there has been a progressive deterioration in the aesthetic qualities of the water, although the chemical features had not appreciably changed since 1931. The water assumed a dirty brown colour and the sides of the brick wall of the steining in contact with water grew a dirty-