Horse myoglobin. This is no. 12 of the projects listed in MS. Eng. e.2347, which developed into a major research topic. It has its own index running 12-1 to 12-34, 12-40, of which 12-29 to 12-34 appear separately at MS. Eng. e. 2349. The work is on specimens received from various sources, crystallisation, X-ray examinations, Patterson and Fourier projections, phase calculations etc. mainly October 1946 - March 1949, re-examined November 1952.