From the Richmond Planet, August 29, 1896:

There is a mad-stone in Richmond and it is claimed that it will prevent hydrophobia. It seems that Henry Hammel, a colored man residing in Henrico County, was bitten by a mad dog, and the stone was secured from its owner Mr. John Fogarty of Oregon Hill for use upon him. It may be seen at the office of the Board of Health, Clerk Aurthor Mayo having charge of it.