The one dated entry in this notebook is from March 1896. At the beginning of the book is a list by Edison regarding various substances to be used in x-ray fluorescence experiments. There is also a longer list of compounds, nos. 130-1298, compiled by Edison and an unidentified experimenter, probably relating to x-ray experiments.The pages are unnumbered, and the book has been used in both directions. Several pages have been removed from the book. Approximately 50 pages have been used.