This series combines the correspondence of Benjamin Silliman and Benjamin Silliman, Jr. Correspondence is arranged alphabetically in each of the four sections. Letters written by either of the Sillimans are filed under the names of the people to whom the letters are addressed. It is necessary to consult the folder title listings in each of the four sections for the correspondence of a particular individual. Correspondence concerning The American Journal of Science and Arts is usually filed in the general A to Z folders. For an alphabetical list of Journal of Science correspondents, consult APPENDIX C.