This notebook was used during December 1914-November 1915, probably by Peter C. Christensen, for notes on chemical experiments. The entries describe various batches of chemicals, including paranitroacetanilide, nitrobenzene, aniline, acetanilide, chloronitrobenzol, and paraphenylenediamine ("para"). Some of the entries include notations by Edison. Inserted into the book is a large drawing by Edison of the production flow for "mother liquor," along with several notes by Edison and a communication from Edgar S. Opdyke of the Edison Chemical Works bearing a notation by Edison. The front cover is marked "1." The spine is labeled "Para - 1." The book contains 202 numbered pages, many of which are blank. Courtesy of Thomas Edison National Historical Park.