SIR,--On the 4th and 6th inst. I published two long letters on the management of art galleries, of some part of which this is a summary:--No one can intelligently and fully enjoy any picture or statue unless he has some measure of three kinds of knowledge. (1) He must know something about the subject represented, or he cannot enjoy the expression by the work of the artist's feeling and thought; (2) he must know something of the processes of the art in which the artist has worked, or he cannot know what effects the artist sought or might have sought; (3) he must know something of the history of the art, or he cannot understand what elements in the work are due to the artist himself and what to his time and place; or enjoy at all some of the finest works ever produced. For the giving of the second and third of these three kinds of knowledge there ought to be subsidiary collections in our Manchester galleries, kept distinct from the principal collection, and for the giving of the first kind there ought to be several distinct subsidiary collections, of which some should be for the purpose of giving knowledge of flowers, birds, trees, and the other beautiful objects which are "elements of landscape." As a very large proportion of the people of all large towns are ignorant of all that is interesting in nature, and of all that is noblest and most interesting in history and in contemporary life, and as pictures can very effectively give some knowledge both of nature and of the deeds of men while fulfilling their special function, which is to give certain kinds of æsthetic pleasure, the principal collections in our galleries ought to be used for the purpose of giving knowledge of nature and of noble human nature. A gallery of good pictures of the kind would, by reason of the interest of the subjects represented, attract so much attention that the public would to a far larger extent than now feel the influence of the artistic qualities of pictures. In order to obtain pictures of suitable subjects, the directors of art galleries, instead of only buying pictures in exhibitions and studios as they now do, should, as a rule, revert to the custom which prevailed in the ages when art influenced life deeply, and should ask artists to paint pictures of prescribed subjects. I believe that they would get thus better pictures and at lower prices. Many artists certainly would be at their best when they knew they were working to enlighten a great community, and would gladly accept a moderate price for a picture ordered for a public gallery.