An essay upon the Witham Spa. [electronic resource] : Or, a brief enquiry into the nature, virtues, and uses of a mineral chalybeate water at Witham in Essex. Wherein The Mineral Substances through which it passes, and the Impregnating Principles thereof are distinctly considered; the Water itself Analytically examined; and its several Component Parts, with their Effects upon a Human Body, separately demonstrated: From whence the Nature of the Spa, and its Excellency in many Diseases, are consequently deduced. By James Taverner, M. B. late of Clare-Hall, Cambridge.