Hodgkin was invited to lecture to Dutch universities by the Organisation of Students in Science and Technology. This was directly followed by a lecture in Aachen to the Chemical Institute there on the subject of 'Crystallography and the Structure of Vitamin B12'. Correspondence re arrangements for visit to The Netherlands and correspondence arising.

Correspondence re arrangements for visit to West Germany. Correspondence arising, includes correspondence re publication of lecture.

Hodgkin was invited to lecture, probably on the structure of vitamin B12, to a conference on Stereochemistry held near Lucerne. Correspondence re arrangements.

Hodgkin gave the Harvey Lecture, entitled, 'Some Observations on Crystallography, Chemistry, and Medicine', Bibliog. 102, to the Harvey Society of New York, and also lectured at the Rockefeller Institute. From there she went to Buffalo, and then on to Ottawa. Correspondence re arrangements; draft of Harvey Lecture; proof.

Hodgkin was invited to represent the International Union of Crystallography at the celebration of the tercentenary of the foundation of the Academie des Sciences de I'Institut de France. Correspondence re arrangements and letter arising.

Hodgkin was invited to Zagreb to the celebration of the 100th Anniversary of the foundation of the Yugoslav Academy of Sciences and Arts. Correspondence re arrangements and correspondence arising.

Hodgkin visited India to attend the symposium, but also toured extensively throughout the month of January, visiting the Universities of Delhi and Madurai, and lecturing at the National Chemical Laboratory, Poona, and at the Trombay Atomic Energy Establishment, Bombay. Correspondence re arrangements and correspondence arising.

Hodgkin was invited to chair the session on 'The Chemical Synthesis and Biosynthesis of B12'. Following the conference, she visited Yale University, Washington D.C., New York, Purdue University and Ottawa, returning to London on 16 July. Correspondence re arrangements, includes itinerary, Jan. 1966-June 1967.

Correspondence re meeting at National Academy of Sciences, Washington D.C., about contacts with Chinese scientists.

Correspondence arising, includes photograph of participants (identified) at conference.

Hodgkin gave a lecture entitled, 'Developments in the crystallographic analysis of the cobalamins'. Correspondence re arrangements, includes programme of lectures.

Hodgkin was invited to give a lecture at a Symposium arranged to celebrate the 80th birthday of L. Ruzicka. She probably lectured on 'Chemistry in Space'. Correspondence re arrangements.

Hodgkin was invited to a conference at Hirschegg, where she gave a paper on the insulin work of her team. Correspondence re arrangements and correspondence arising.

Hodgkin was invited to serve as Vice-Chairman for the session devoted to 'Biosynthesis'. Letter of invitation only.

Hodgkin attended the Lilly Research Laboratories meeting on proinsulin in Indianapolis, on the way giving a talk on the structure of insulin to a colloquium held at the University of Chicago. Correspondence re arrangements.

Hodgkin gave a paper on 'Some characteristics of protein crystals', Bibliog. 127, and contributed to various discussions at the conference. Correspondence re arrangements. Includes draft abstract of Hodgkin's paper. Feb.-Mar. 1968, Feb.-June 1969.

Typescript of Hodgkin's discussion remarks at conference, amended by Hodgkin.

Correspondence arising, re publication of paper.

Hodgkin attended a meeting of the Deutsche Akademie der Naturforscher Leopoldina at Halle, where she was the Royal Society's official representative. This was followed by a colloquium entitled 'Röntgenkristallstrukturanalyse', held in Berlin in honour of the 60th birthday of K. Boll-Dornberger, where Hodgkin gave a paper on 'Recent developments and results in X-ray analysis'. Correspondence re arrangements, Aug.-Oct. 1968, Feb.-Sept. 1969.

Memorabilia, includes programmes for both events. Correspondence arising, includes article (in German) on the Leopoldina meeting.