The material is presented in an alphabetical sequence and covers both British and overseas organisations.

While some entries are relatively trivial and deal with membership, invitations to meeting and the like, others are substatial folders covering a lengthy time-span and matters of consequence such as research policy and the refereeing of grant applications. Of particular importance in these respects is the material regarding the Natural Environment Research Council of which Bullard was a founder member.

Also included in this Section are the papers reflecting Bullard's continuing interest in the work, history and personnel of the National Physical Laboratory after he resigned as Director in 1955 to return to Cambridge.