Hard-cover notebook inscribed on front cover: "John H. Daymond. Chimica Biologica. 1956"

Daymond was Chain's technician during part of his time in Rome. The front two-thirds of the notebook contains records of a series of 104 aeration experiments, January-October 1956, while the remainder is mostly taken up with analyses of various substances, September 1956-January 1957. There are also a few loose pages of notes (some in Chain's hand) and printed matter tucked inside the notebook at various points.