This series is divided into two subseries: General meetings and Executive Committee meetings each of which is arranged chronologically. The General Meeting minutes include both Social Days and Business Days. Earlier minutes (1868-1925) are bound. Printed cards listing the questions for discussion at specific meetings are also included.

This series is divided into three subseries: Programs, Committees, and Yearbooks. The Programs subseries contains printed programs for meetings between 1883 and 1913. The Committees subseries consists of material related to the twenty-one committees that have been active in Sorosis at various times between 1879 and 1967. The committee records are arranged alphabetically. The Yearbooks subseries contains yearbooks printed by Sorosis that consist of lists of the members and officers, and by-laws. Some of the yearbooks contain schedules of events for the upcoming Sorosis year. There is a broken run of these yearbooks, 1889-1914; 1935-1983.

This series has two subseries: Anniversaries and Writings and publications. The first subseries includes reports of anniversary celebrations (1872-90) and anniversary programs (1871-1979). The twenty-fifth, seventieth, seventy-fifth, and hundredth have their own sections and are arranged chronologically. There are also photographs from the hundredth anniversary located in Oversized box 30. The Writings and publications subseries contains books and essays on the history of Sorosis written by its members as well as press clippings pertaining to Sorosis history. Of particular interest is a history by Jennie June Croly, Sorosis: Its Origins and History (1886).

There are two subseries in this series: Presidents and Other officers. The Presidents subseries contains information on two early presidents of Sorosis: Charlotte Beebe Wilbour and Jane Cunningham Croly. The former consists of speeches by Wilbour and an address by Deborah Jackson McLeod about Wilbour (1973), and the latter consists of a biography of Croly written by her daughter, and Memories of Jane Cunningham Croly "Jennie June" compiled by members of Sorosis after her death. In addition there are selected annual reports by the President which provide a record of Sorosis activies as well as lists of the presidents (1897-1901). Other officers contains reports of additional officers including the Recording Secretary, the Vice President, the Corresponding Secretary, and the Chairman of Reception. It also contains "Chairman of Executive's Work" by E.F. Turtle, a description of the work taken on by the Chairman of the Executive in 1929.

This series contains three subseries: Lists, Writings and Membership Corporation Law. Included in the Lists subseries are the earliest membership list (1870-71), membership and attendance lists (1868-1968), typed "Who's Who" (1947-8 and circa 1980), a binder of biographical information about deceased members (circa 1975) and death notices (1967-71). The "Who's Who" contains education, birth and death dates, and profession as well as information about the member's activities within Sorosis. The Writings subseries contains writings by Sorosis members. These include unpublished manuscripts (1893-1966), miscellaneous publications (1932-1964), and three books written by Gladys Ewing Combes. The Membership Corporation Law is an old statute of the State of New York that was combined into the current Non-For-Profit Corporation Law and dictates how an organization may be formed. The Sorosis copy of the Membership Corporation Law is fragmentary, containing only sections 6, 11, 14 and 15 and is undated.

This series consists of publications produced by and about Sorosis and includes clippings and articles (1886-1901); The Women's Cycle (1890); Sorosis Monthly Bulletins (1955-78); Esther Herrmann Testimonial (1902); Sorosis Verse (1938); and Sorosis: A Federated Woman's Club (1982).There are additional publications in SERIES V. MEMBERS.

This series contains information and materials pertaining to the Women's Congress, the MacDowell Colony, the New York State Federation of Women's Clubs, the Ossoli Circle, the Soldiers and Sailors Club and the General Federation of Women's Clubs. These organizations were affiliated with, or related to, Sorosis.

This series contains books created by Sorosis, including numerous scrapbooks and the Sorosis Valentine Party Book. There are also books and other items given to Sorosis, such as Four Centuries After: Or, How I Discovered Europe by Ben Holt, two gavels, sheet music, a guestbook, awards, items commemorating Sorosis-related events and three portraits of Charlotte Beebe Wilbour, one painted and two in plaster.