By the 1930s Gunn had turned completely against the occult. He was highly antagonistic to Frederic H. Wood, who claimed that a long-dead Egyptian princess spoke, in ancient Egyptian, through "Rosemary". This form of "speaking in tongues" is known as xenoglossy. Rosemary's utterances were recorded phonetically and an Egyptologist, Mr. Hulme, claimed that Rosemary's speech conformed to the ancient Egyptian tongue, and could be translated into English. In the June 1937, issue of the "Journal of Egyptian Archaeology", Gunn claimed that Hulme had manipulated the transcriptions to fit his own expectations of what he imagined ancient Egyptian to sound like. A later examination by John D. Ray (then the Sir Herbert Thompson Professor of Egyptology at the University of Cambridge) confirmed "there could be no mistaking Hulme's incompetence". Furthermore, both Gunn and Ray pointed out that Rosemary's visions of camels as domestic transport were inconsistent, as camels were not used for transport in 18th Dynasty Egypt. Wood's book on the subject, "Egyptian Miracle", makes repeated derogatory references to Gunn, including "Also, the passing of our opponent Battiscombe Gunn, in 1950, can be recorded with the comment, De mortuis nil nisi bonum."