Manly Palmer Hall [P.R.S.] MS. 213. 28 folios. 206 x 162mm. 18th Century. [This is included in the Bacstrom Collection MS. 102, Vol. 3.] Extracts from Letters. Written at Brussels A.D. 1645-6. on the Philosophers Stone Supposed to be the Work of Sendivogius. Copied from a Manuscript.