All necessary postal knowledge of immediate public interest is herein set forth in such compact shape as to acquaint the reader with what he might want to know, or direct his inquiry to sources of wider information if the desire was not satisfied with the reference thereto which this work might afford. In general it will be found amply sufficient for all ordinary purpose as the scope of subjects is as wide as the active operations of the Department at present include. The special articles referring to subjects of general postal interest cover a considerable range of inquiry and deal more fully with those matters which are but briefly mentioned in that portion devoted to the purely business details of the Department. Much of this material is new and all of it treated so as to interest the reader. These articles on general postal topics in connection with the other matter herewith given, relating to the service, may please some one here and there and perhaps justify the publication of this little contribution to the literature of the time. L. M. Washington, D. C. March 15, 1917. To Mr. Ruskin McArdle, late Private Secretary to the Postmaster General, now Chief Clerk of the Department, whose friendly regard I have long enjoyed and whose courteous and considerate treatment to all with whom his official relations have brought him into contact, this little volume is respectfully dedicated as a mark of appreciation and a token of deep and lasting esteem. THE AUTHOR. ORGANIZATION OF THE DEPARTMENT The operations of the postal service are conducted by divisional arrangement with the duties of each accurately and specifically defined. Previous to this administration much of the work of the various bureaus was found to be overlapping each other and exercising a separate authority in correlated matters. These officially related duties were each brought under a proper head, insuring prompt attention and fixing a definite responsibility which has been found to be of recognized benefit and value. OFFICE OF THE POSTMASTER GENERAL