By order of Colonel Tillman: D. H. TORREY, Captain of Infantry, Adjutant. They may be unnumbered, as in the following case, when they are of a temporary nature. West Point, N. Y., February 27, 1917. MEMORANDUM: Residents of the Post are informed that a case of chicken pox exists at the Hotel. The usual precautions against spreading the disease are enjoined. (Tel. memo. Surgeon.) By order of Colonel Biddle: C. C. CARTER, Major, C. A. C., Adjutant. NOTE.—The War Department issues also certain _Special Regulations_ for particular General Orders to which it wishes to call attention, and puts out in pamphlet form _Changes_ to _Regulations_. Both _Special Regulations_ and _Changes_ belong to the class of the General Order, and, therefore, are not taken up separately here. CHAPTER XII OFFICIAL CORRESPONDENCE—EXPLANATIONS—LECTURES _Official Correspondence_ includes official letters, rolls, returns, estimates, requisitions, and routine reports. The _Official Letter_ includes (1) letters to persons in the military service, (2) letters to persons outside the military service, and (3) official telegrams. Number 1 has its particular military form which must be precisely followed. It consists of { The Brief { The Body { The Ending { Indorsements { Enclosures _The Brief_ consists of the following in the order { The Heading { From Whom Sent given { To Whom Sent { The Subject An example of a _Brief_ would be: Hq. Eastern Department, Governors Island, N. Y., May 21, 1940. From: The Adjutant. To: Captain James L. Douglas, 99th Inf. (Through C. O. Madison Barracks, N. Y.) Subject: Delay in submitting report. Another example would be: Company A, 99th Infantry, Madison Barracks, N. Y., Jan. 9, 1940. From: Commanding Officer, Co. A, 99th Inf. To: The Commanding Officer. Subject: Insufficiency of shoes. Another example of a _Brief_ would be: Madison Barracks, N. Y., Jan. 10, 1940. From: Captain James L. Douglas, 99th Inf. To: The Adjutant General of the Army (Through C. O. Madison Barracks, N. Y.) Subject: Request for leave of absence.