The Book on Mediums : A Guide for Mediums and Invocators

The Book on Mediums, also known as The Mediums Book, was written by Allan Kardec and originally published in 1861. It is the widely respected follow up to The Spirits Book which was published in 1857 and is the second in a series of five books that Kardec wrote that are collectively known as the 'Spiritist Codification'.