VI PREFACE succeeding volumes now in preparation, for numerous extracts from the sale - catalogues, with purchasers' names and prices, which are in his possession. I must accord him hearty thanks for these. I must not await the appearance of the supplement in order to correct a mistake of importance which crept into the third volume through my too ready acceptance of informa- tion given to me. The history of " The Laughing Mandoline- Player " (Hals 82) is correctly stated as follows : A modern copy is in an English private collection. Exhibited at the Royal Academy Winter Exhibition, London, 1891, No. 72 ; and in Paris, 1911, No. 55. Sale. Capello, Amsterdam, May 6, 1767 (Terw. 587), No. 28 (58 florins). In the collection of Count Bonde, Stockholm ; sold to the London dealer Martin Colnaghi (for 2500 francs). In the possession of the London dealer Wertheimer. In the collection of the late Baron Ferdinand von Rothschild, Waddesdon Manor. In the possession of the London dealer Gooden, London, 1896. In the possession of the London dealer Martin Colnaghi. In the possession of the Paris dealer C. Sedelmeyer, " Catalogue of 100 Paintings," 1896, No. 19. In the collection of A. V. Picard, Paris. In this volume Dr. Kurt Erasmus has prepared for the press the whole of the Jacob van Ruisdael section, and he has revised and finished the M. Hobbema and Adriaen van de Velde sections, which were commenced by Dr. W. R. Valentiner. The revision of the Paulus Potter section is the work of Dr. Kurt Freise. C. HOFSTEDE DE GROOT. 's GRAVENHAGE, July 1911.
