2026 156pp Ninth Circle Press. Illustrated including colour. Black Wintan leather with design and titling foiled in gold. NEW.
 
Ltd. ed. 140 copies, signed and numbered plate loosely inserted. Transcribed and Reformatted by A.D. Mercer. Liber Quattuor Experimentorum Or the Four Experiments of the Spirits Birto, Agares, Bealpharos and Vassago. A practical grimoire written to enable the adept to summon and communicate with the four spirits.
 
The book contains a full-colour reproduction of Frederick Hockley's original handwritten manuscript, A verbatim transcription of the original text and a complete transcription in modern English with all missing text and imagery included in order to make this a fully workable grimoire, making this the most complete edition of the manuscript published to date.

Also included are studies of the four spirits, examining their origins and development, together with a history of the Four Experiments and the different versions found in related manuscripts.

The volume also includes the version of the Four Experiments contained in Wellcome MS 3203, Henry Dawson Lea's Five Treatises upon Magic, reproduced in full alongside a new transcription, with the illustrations redrawn for clarity. The final section reproduces The Experiment of Bealphares from Reginald Scot's The Discoverie of Witchcraft, which appears to preserve the source material from which the Bealpharos experiment later developed.