Where carriers are unable to deliver all mail matter taken out on the last trip of the day without making overtime, they must return to the post office within the eight hours prescribed with the understanding that they make a full report to the superintendent of the station, and a full statement will also be made on the trip report of the day. Carriers are required to deliver all mail taken out on the earlier trips, even though such delivery necessitates exceeding the time allowed by the schedules for such trips, unless collections are made for an important dispatch, in which event the latter must be met and mail remaining undelivered will be delivered on the following trip. Every letter carrier must keep a route book, which should be a complete directory of the persons served by him, and all changes of address should be posted daily. Carriers must record daily in their log books the disposition made of all undelivered mail. The forwarding of mail, and notifying publishers of changes of address is clerical work, and should not be performed by carriers. Carriers are not permitted to perform clerical work. Their work must be confined to the collection and delivery of mail; the routing of mail for delivery; the making up or “logging” of undelivered matter; receipting for and the recording of registered mail; posting route books; the facing of mail collected by them, and, at offices where hand-feed canceling machines are used, the facing of mail directly into such machines, and to duty at carriers’ delivery windows. In the performance of their duties letter carriers must be civil, prompt and obliging. Carriers must attend quietly and diligently to their duties, and under no circumstances must they loiter or stop to converse on their routes, and they must refrain from loud talking, profane language, and smoking in the office or on their routes. Carriers must not solicit, in person or through others, contributions of money, gifts, or presents; issue addresses, complimentary cards, prints, publications, or any substitute therefor intended or calculated to induce the public to make them gifts or presents; distribute, offer for sale, or collect the proceeds of the sale of tickets to theatres, balls, concerts, fairs, or any other entertainment; issue for profit souvenirs or postal handbooks, or in any manner co-operate with or assist the publishers of souvenirs or postal handbooks to secure the patronage of the public; compile city directories for public use or assist publishers to compile the same; borrow money from patrons on their routes; or contract debts which they have no reasonable prospect of being able to pay.