Sinclair discusses a séance which takes place in chapters four and five of Dragon's Teeth, writing "it parallels closely other séances which I know about." He goes on to ask Kress to send "something for a test with [Arthur] Ford." Arthur Ford, a former Disciples of Christ minister, became a renowned medium and co-founded the First Spiritualist Church of New York. Sinclair and Ford met in 1930 when he conducted a séance for Sinclair and professed to channel Sinclair's friend, writer Jack London.