A comparison of the dates leads to some dubiety as to who was the actual draughtsman of this portrait. There were three well-known Dutch painters of the name of Mieris—Frans Van Mieris, the pupil of Gerard Dow, born at Delft in 1635, died at Leyden 1681; Willem Van Mieris, his son, born at Leyden 1662, and died there, 1747; and his son, Frans Van Mieris, the younger, born at Leyden 1689, died there in 1763. The year in which the drawing was executed must have been 1695, consequently it cannot be the work of the elder Frans; nor can it have been done by his grandson, the younger Frans, who was then only six years of age. A solution of the difficulty seems to be afforded by a comparison of the “Travels” and the “History” of the Baron. In the former, a journal written at the time, he states that he was instructed in art at Leyden, by “Miris,” but in the latter, compiled from the former many years afterwards, he states that “Francis Miers, a very great painter,” was his teacher, the Christian name being apparently added from memory, which, in the present case, seems to have played him false. There can be little doubt that the portrait was drawn by Willem Van Mieris, who at the time of Clerk’s residence at Leyden was forty-one years of age, and in full practice as an artist. As corroborating this supposition, we may notice that in the account of the Clerks of Penicuik contributed by Miss Isabella Clerk to the “Life of Professor James Clerk Maxwell,” and “chiefly derived from a book of autograph letters which was long kept at Glenlair, and is now in the possession of Mrs. Maxwell,” it is stated that the Baron was a pupil of _William_ Mieris in drawing; and further, that a drawing of two men’s heads similar in style to the present portrait, preserved in the Penicuik Drawing-room, is inscribed in the Baron’s hand, “Originall by William Van Miris, 1696,” indicating that about the date he must have been in communication with this artist.