Much has already appeared in the newspapers about the loan exhibition of Dutch masters that will be open to the public tomorrow at Burlington House. For mere size and scale and the staggering value of the pictures brought together, the exhibition is an epoch-making event. Artistically it is also a rare opportunity of studying the whole pageant of the Dutch school. Mr. Wilenski, the art critic, who will talk about the exhibition tonight, has just published an 'Introduction to Dutch Art.' Listeners will remember that he edited the special photogravure supplement on 'The Nativity in Art,' which appeared in the Christmas Number of The Radio Times.