A chronological log of the activities and experiments done by members of the Stellarator Division of Project Matterhorn at Princeton University, in work performed for the United States Atomic Energy Commission towards the goal of constructing a controlled thermonuclear reactor. The log book includes descriptions of experiments and their results, with accompanying diagrams, graphs, and mathematical calculations. The entries in the log are initialled by the persons who wrote them. Among the personnel who contributed to this log book were G. Frederick, Leonard M. Goldman, Ernie Ray, Martin Schwarzschild, Lyman Spitzer, and Clodius H. Willis.