Printed and typewritten versions of the Society's constitution and By-laws. A few of the printed editions also include a list of members. Additionally, there is an incomplete "articles to incorporate" as a non-profit corporation in the state of Michigan.

Typed and handwritten minutes of meetings, including the Society's organizational meeting of March 30, 1946, and all business and Council meetings thereafter. When business and Council meeting minutes could not be separated, they are retained together. The last folder in this series contains agendas from both the business and Council meetings.

Correspondence and reports of the President, Secretary, Treasurer, Editor arid American Institute of Biological Sciences (AIBS) representative, with lists of officers and council members for 1946-1975 and 1979-1981. Elected to a three year term, the Secretary administered the Society's affairs and therefore handled the bulk of its correspondence. Records of transactions conducted by the Society are most likely to be found in the Secretary's correspondence, from discussion on the constitution and advice to aspiring biologists to the battles with Creationists and letters welcoming newly elected officers. The Secretary also reported annually to the Council. The correspondence of the President also includes some correspondence of the President elect, and some material of interest relative to Creationism.

The Editor likewise reported to the Council at its annual meeting both the financial condition of Evolution and statistics regarding the manuscripts submitted for publication. Some correspondence of the Managing Editor is also located in this section.

Material relating to the Nominating Committee, including nominations, biographical sketches of the nominees, vote tallies and correspondence. Although a committee of the Society was never formed to discuss Evolutionary Monographs, the series also contains information about Leigh Van Valen's one-man quest to convince the Society to produce a second publication for works too long to be published in Evolution. The Education Committee concerned itself largely with the repeated attacks of Creationists on evolution in the 1960s-1980s.

The bulk of the series is comprised of correspondence with authors and reviewers of Evolution, dating from Ernst Mayr's term as Editor to the present. Reviewers' comments and the Editor's correspondence with reviewers are filed under the author's name except when the name of the author is not known, in which case they are filed under the name of the reviewer. Several folders are quite complete, including the author's letter requesting that his or her manuscript be considered for publication, Mayr's acknowledgement of receipt of the manuscript, his letters to the reviewers (2 each), the reviewers' response, Mayr's letter informing the author of the decision, and the author's response to that decision. Only very rarely is the manuscript included.

Mayr was tireless in his pursuit of articles for Evolution and corresponded with prospective authors over long periods of time in hopes of soliciting material for the new journal. Finally, the series also includes some general information about the journal, concentrated in the periods 1946-1950 and 1981-1985.