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' vi PREFACE opinion to the best of my ability. Of the pictures in private collections I have mentioned only those that seem to me genuine. But for the reason just assigned I have practised the greatest reserve in my remarks on quality and condition. I have only spoken freely about the pictures in public collections. My assistant, Herr Kurt Freise, has prepared for the press the materials for the catalogues of both the masters included in this volume. C. HOFSTEDE DE GROOT. , THE HAGUE, 1908.
