This letterbook covers the period July-August 1894. Most of the correspondence is by Edison and Walter S. Mallory, vice-president of the company. The letters deal mainly with equipment and supplies. Some of the letters pertain to the company's financial status. One item mentions Edison's test of drinking water. The front cover is stamped "Copying Book" and is marked "July 17th 1894 to August 18th 1894 inclusive." The spine is labeled "#4 July 17, 1894 to Aug 18, 1894." The book contains 500 numbered pages and an index. Approximately 2 percent of the book has been selected.