Part 13 · Chapter 25

And these two heads divide and become three heads, besides the upper head that is not known; but only the two are divided and become three heads, and these three heads are called: skull [Galgalta], brain [Mocha], and air [Avira]. And they are below this RDL"A, as above. Therefore we shall now explain the aforementioned statement at the beginning of the Idra Zuta, page 288, the statement "Three heads are engraved, one within the other, and one above the other," etc.