Dr. Paul Clark, in his book on Case, mentions his own examination of the original Cipher manuscripts on which Mathers founded the first order Golden Dawn rituals. Clark found that the "Cipher manuscripts refer to a set of tablets from the 'Old Manuscripts,' but do not specify Dee or Kelly's work by name. Mather's [sic!] had been doing much research in the British Museum where the Dee manuscripts were housed. It was natural for him, perhaps mistakenly, to assume these were the ones referenced in the Cipher manuscripts. Unfortunately, this was not necessarily the case."