Letters compare the growth of cabbages cultivated in hardpan soil with cabbages fertilised with homemade compost of kitchen and garden waste, and requesting copies of photos taken of the cabbages. The final letter dated 19th July 1975 also contains remarks by Leake regarding pollution and the Waste Management Advisory Committee, which he criticises for only having two members who have qualifications in wastes of refuse and sewage.

A large proportion of the records in this category - Records relating to the interactions of the town and University of Cambridge - relate to the exercise until the mid-nineteenth century of the University's extensive jurisdiction over licensing. A smaller amount covers joint University/town activity in environmental improvements. More modern papers relate to local planning issues.