The medium Frank Decker was exposed as a fraud in 1932. A magician and séance sitter who called himself M. Taylor presented a mail bag and Decker agreed to lock himself inside it. During the séance objects were moved around the room and it was claimed spirits had released Decker from the bag. It was later discovered to have been a trick as Martin Sunshine, a magic dealer admitted that he sold Decker a trick mail bag, such as stage escapologists use, and had acted as the medium's confederate by pretending to be M. Taylor, a magician. The British medium Estelle Roberts claimed to materialize an Indian spirit guide called "Red Cloud". Researcher Melvin Harris who examined some photographs of Red Cloud wrote the face was the same as Roberts and she had dressed up in a feathered war-bonnet.
Mina Crandon claimed to materialize a "spirit hand", but when examined by biologists the hand was discovered to be made from a piece of carved animal liver. The German apport medium Heinrich Melzer was discovered to be a fraud in 1926. In a séance psychical researchers found that Melzer had small stones attached to the back of his ears by flesh coloured tape. Psychical researchers who investigated the mediumship of Maria Silbert revealed that she used her feet and toes to move objects in the séance room.
Theosophy is in opposition to the spiritualist interpretation of evolution. Theosophy teaches a metaphysical theory of evolution mixed with human devolution. Spiritualists do not accept the devolution of the theosophists. To theosophy humanity starts in a state of perfection (see Golden age) and falls into a process of progressive materialization (devolution), developing the mind and losing the spiritual consciousness. After the gathering of experience and growth through repeated reincarnations humanity will regain the original spiritual state, which is now one of self-conscious perfection. Theosophy and spiritualism were both very popular metaphysical schools of thought especially in the early 20th century and thus were always clashing in their different beliefs. Madame Blavatsky was critical of spiritualism; she distanced theosophy from spiritualism as far as she could and allied herself with eastern occultism.