Although I am familiar with Rembrandt's work, through photographs and black and white reproductions, I invariably experience a shock from the colour standpoint whenever I come in touch with one of his pictures. I was especially struck with that masterpiece of his at the Hermitage, called the Slav Prince, which, by the way, I am convinced is a portrait of himself; any one who has had the idea suggested cannot doubt it for a moment; it is Rembrandt's own face without question. The reproductions I have seen of this picture, and, in fact, of all Rembrandt's works, are so poor and so unsatisfactory that I was determined, after my visit to St. Petersburg, to devise a means by which facsimile reproductions in colour of Rembrandt's pictures could be set before the public. The black and white reproductions and the photographs I put on one side at once, because of the impossibility of suggesting colour thereby.