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36 Colour Printers prior to 1834 sterdam as a Portrait and Miniature Painter. Here in all probability he studied a copy of Newton's " Optics," pubTished in 1704, and from Newton's theory of the composition of light by the three primary colours, Red, Blue, and Yellow, evolved his process of producing Colour- prints from Mezzotint engraved plates. His process was to engrave in Mezzotint three plates with different portions of the subject, each plate bearing on its engraved surface the required proportions of Red, Blue, or Yellow, which according to Newton's theory would produce the required pictorial Colour-tones to complete the painting he was reproducing. Mezzotint Engraving was invented in 1643 by Ludwig Von Siegen, an Officer in the service of the Landgrave of Hesse, who was a prominent amateur artist, and the first reputed Mezzotint was produced by him at Amsterdam. Von Siegen showed the secrets of his Mezzotint process to Prince Rupert in 1654, and the Prince brought the " New Art " over to England, and the portrait of Charles II., dated 1669, by William Sherwin, the first English Mezzotinter, bears the Engraver's acknowledg- ment of his indebtedness to Rupert for the secrets of the methods. I do not propose to enter into the various vicissitudes which beset Le Blon during the twelve years he was operating his three-colour Mezzo- tint Process in England. My only reason for introducing his Process is to show the date of the commencement of Colour Picture Printing in this country. I am now going to introduce you to a Process which is more akin to Baxter's methods, and which as can be seen from a study of Baxter's Specification at the Patent Office Library, showing that he was no stranger to what had been done in the evolution of Colour Printing before