Waddington worked with Joseph and Dorothy Needham in Cambridge in the early 1930s, and together they published various articles. In 1932 Waddington spent six months in Germany to work under Professors Spemann and Mangold after being granted a Rockefeller Travelling Fellowship. It is not known whether some of this material relates to these aspects of Waddington's work, although the annotation of 'KW Inst. Berlin' (presumably the Kaiser Wilhem Institute for Medical Research) would certainly suggest this.