The best method of working is to study primarily the Anglo-American Code, comparing rule by rule with the corresponding portion of other codes, noting differences as they occur. Necessity often arises for dealing separately with the contents of a book. Consider the extent to which analytical treatment should be carried out, and the form of the entries necessary. READING LIST. Anglo-American Code--Rules _1-111; 130-135; 167-171_. Bolton--Anglo-American joint code of cataloguing rules, _1908_. _L.W. Vol. 12, 1909-10, pp. 382-390._ Cutter--Rules _1-119; 193-196; 352-369_. Fellows--Cataloguing rules. _pp. 16-37; 58-86; 97-130; 144-257_. Guppy--Cataloguing of anonymous literature. _L.A.R. Vol. 3, 1901, pp. 298-313._ Hitchler--Cataloguing. _Chap. 3; pp. 7-16; 19-22_. Quinn--Library cataloguing. _Chaps. 4-13._ QUESTIONS. _1._ Under what name or form of name would you enter:--(_a_) authors with compound surnames; (_b_) noblemen; (_c_) trials; (_d_) monarchs; (_e_) authors who have changed their names. _2._ Show by examples how you would catalogue books by a married woman who has written under maiden and married names. _3._ Give the ruling of the various codes with reference to the treatment of anonymous books. _4._ What is the Anglo-American Code rule governing (_a_) a book showing initials instead of an author’s name upon the title page; (_b_) government reports? Give examples. _5._ Define “analytical entry,” and say what works compel the use of this entry. _6._ How would you catalogue (_a_) a commentary; (_b_) an anthology; (_c_) a dissertation; (_d_) transactions of a society. _7._ Give a full entry, with the necessary references, for a work written pseudonymously. _Lesson 4._ SUBJECT ENTRY. REFERENCES. FORM ENTRY. Here we face the most difficult and vital part of cataloguing, requiring the maximum amount of care, ability, and discretion, so essential is the choice of correct headings to the success of a catalogue. There are no fixed rules as in the case of author entries, and few cataloguers, even of long experience, feel completely satisfied with their work in this direction. As a warning to the unwary, it has truly been said that in the choice of subject headings and cross references more absurdities can be perpetrated than in any other branch of library work.