226. Postal District
If the Address be in London add the letters of the postal district in which it happens to be, for this also saves trouble in the General Post Office. Thus in writing to the publishers of "Enquire Within," whose house of business is in the East Central (E.C.) postal district, address your letter to Messrs. Houlston and Sons, Paternoster Square, London, E.C.
227. Heading
At the head of your Letter, in the right-hand corner, put your address in full, with the day of the month underneath; do not omit this, though you may be writing to your most intimate friend for the third or even the fourth time in the course of a day.
228. Subject
What you have to say in your Letter, say as plainly as possible, as if you were speaking; this is the best rule. Do not revert three or four times to one circumstance, but finish as you go on.
229. Signature