The article is 'Problems of Translation and Modernisation of Ancient Chinese Technical Terms: Manfred Porkert's interpretation of ancient and medieval Chinese natural and medical philosophy'. It was first published in 'Annals of Science, Volume 32, Number 5', September 1975.
The letters also discuss a comment in an article by Anthony G. N. Flew, 'The Cultural Roots of Analytical Philosophy', ('Journal of Chinese Philosophy', March 1979), stating that Needham is a Communist Party member.
The related documents comprise a copy of a letter from Derk Bodde of the University of Pennsylvania, U.S.A., to Cheng, protesting at the publication of the comment about Needham's political affiliation; letter from Bodde to Needham, about the comment and a meeting between Needham and Henry Rosemont; copy of a letter from Cheng to Bodde, about the comment; circular letter from Cheng about the activities of the the International Society for Chinese Philosophy.