Glasgow University Library MS. Ferguson 134. 31 folios (11 blank). 155x92mm. 17th Century. Experimental Seacrets found out in the way of my owne painting. [By Charles Beale.] [Note on f2v]: 'Autograph of Mr Beale Experimental Secrets in Painting - he was contemporary of Sr Peter Lely and greatly in his esteem.' [Observations on pigments, etc., from the period 1647-1663.]