This undated notebook was probably used sometime during the period 1901-1902. Most of the entries are by Edison; some are by an unidentified experimenter. The book contains a list of chemical compounds, mostly organic, with brief descriptions of each compound's physical properties. The number following each entry refers to a key on the first page of the book that provides a set of twenty-one descriptive categories for the substances, including "amorphous," "ductile," "pitchy," "soapy," and "waxy." The spine is labeled "151." The pages are unnumbered. Approximately 60 pages have been used.
Courtesy of Thomas Edison National Historical Park.