There are 3 notebooks in the series:
- Volume 1, about 100 pages, has observations on insects, dated between 1901 and 1915.
- Volume 2, about 50 pages, contains notes on insects on a few pages only.
- Volume 3, about 200 pages, has observations on insects written from 30 June 1873 to 1879 and has a list of species.
Besides the notebooks, there are various letters to Jenkinson, including a letter from his sister dated 6 July 1873.