A sinister image from a French “tableau”. The description refers to two degrees from the Ancient and Accepted Scottish Rite.
There is a similar image in Kloss “Second Grade Elû”. The old ‘elect’ degrees have become the degrees of the AASR that are known as ‘vengeance’ degrees. One skull on a spike is most likely the remains of the first murderer of Hiram.
Top: 18th century painting from Mons, Belgium. They are reprinted online and in print on several places. Facsimiles of the entire collection appear in Dix-Sept Tableaux Symboliques du XVIIIe Siecle (1992) by Maurice-Aurélien Arnould (1914-2001)
Bottom: image in the collection (1844) of Georg Kloss (1787-1854) (Collection de 84 tableaux, Kl.MS:XXV.1)