These notebooks contain lectures or reports on lectures, with corresponding watercolor and pen-and-ink drawings. There are volumes on geology (Great Britain and elsewhere), natural history, mechanics (sketches of levers, valves, and weighing machines), and steam engines (sketches of mechanics of boilers).

By an unknown author, this notebook is of experiments and the history of experiments with electricity, containing references to Franklin, Beccaria, and Priestley, etc.

There are botanical notebooks which concern Bunbury's study of fossil plants in general, with special studies on the fossil plants in the Geological Society in Richmond, Virginia, and at Aix-la-Chapelle, Cape Breton Island, and Pennsylvania. There is also a historical sketch of eminent English naturalists.