The whole subject involved in this case is beset with difficulties, and the duty of the Postmaster General in administering the act is a most delicate one. Few would, I suppose, doubt that some prevention of the mailing of lewd publications is desirable, and yet no field of administration requires better judgment or more circumspection to avoid interference with a justifiable freedom of expression and literary development. I have little doubt that numerous really great writings would come under the ban, if tests that are frequently current were applied, and these approved publications doubtless at times escape only because they come within the term ‘classics,‘ which means, for the purpose of the application of the statute, that they are ordinarily immune from interference, because they have the sanction of age and fame, and usually appeal to a comparatively limited number of readers. It is very easy, by a narrow and prudish construction of the statute, to suppress literature of permanent merit. These considerations of administration, however, are not for the courts, except in cases where the judgment of the Postmaster General has been wholly arbitrary and without foundation.