it's anagramed Italian
Page f99r was my rosetta stone into this thing. It's anagramed Italian. My initial paper about it is up at https://zenodo.org/records/20109175
An example from page f2r top half: Transliterated text using Edith Sherwood's AVA alphabet. AVA => anagram => Italian
<f2r.1> <%>labma apcoi bam olcai apcain ctloisaalba m(mercurio) capo i(in) amb(alembic) colai pacam(pacatam) ctliosa(calcinosa)
Place the white mercury in the head of the alembic; I strained the pacified matter into the caustic-lime mixture.
<f2r.2> borcora ctlar s<->ator cha {cho}bor cor(cora) ctlar(con tinctura lac aqua radice) s(sive) ator(a torre) cha(chale) cho
The heart of the borax with a tincture of milk, water, and root, or rather heated here in the furnace tower.
<f2r.3> volam chea a cor ca aba camvola m(mercurio) a(ab) che a(ad) cor(core) ca(cale) a(ab) ba(balsam) cam(camera)
The mercury flies from that which is at the heart of the heat, from the balsam chamber.
<f2r.4> atmba clob ba cpa bais cotlam batmba(ab tincture mercurio balsam) cho(chale) b(bene) ba(balsam) cap(capo) basi(base) colta(colmata) m(mercurio) b(bene)
From the mercury-balsam tincture, heat the balsam well through the head and base until it is well-settled.
<f2r.5> olocor ai atobam coibn alcam bncol oro ai atoamb(ad tomba) coni(coniuncti) b(bene) macla be(bene)
With the golden essence at the tomb [vessel base], the fusion is well-joined.
<f2r.6> sam banb<->btloi sor aloiba bcoi bca chasam(sale) ba(balsam) nb(ab) bolit(bolita) sor(ros-colore) aloiba bcoi(bene-coniuncti) bca(mouth) cha(chale)
Let the rose-colored extract of the balsam salt boil; it is well-joined in the alembic and heated at the opening.
<f2r.7> ator cha bama coibn<$>ator . hac . amb(alembic) a(ab) . coni b(bene)
Heat the balsam at the tower until it is well-joined.
Smoothed out as English: Place the purified white mercury into the head of the alembic; I then poured the stabilized matter into the caustic-lime mixture. Add the essence of the borax along with a tincture of milk, water, and root—or rather, heat it here in the furnace tower.
The mercury then volatilizes from the center of the heat, moving from the balsam chamber. From this mercury-balsam tincture, heat the mixture thoroughly through the head and base of the vessel until the mercury is well-settled.
With the golden essence now at the base of the vessel, the fusion is successfully joined into a solid mass. Finally, let the rose-colored extract from the balsam salt boil; it is well-joined within the alembic when heated at the mouth. Apply a steady heat at the furnace tower until the balsam is perfectly fused."