Correspondence with organisers of International Conference on Magnetism and Crystallography, Kyoto, September 1961. Material on conference arrangements, Blackett's paper and publication, correspondence with colleagues in Japan re programme of visit, requests to visit and lecture, letters of thanks. Correspondents include: Naoto Kawai, Naoiti Kumagai, Denzaburo Miyaji, Takeo Nagamiya, Takesi Nagata, Tsuneji Rikitake, Yataro Sekido, Masakuma Uchiyama, 1961