Molecules of rabbit skeletal myosin have been examined in the electron microscope after drying at low temperature from solutions containing ethylene glycol or glycerol and rotary-shadowing with platinum. Analysis of the structure has been assisted by stereo-photography. While the general appearance, two heads attached to a long tail, is similar to that described by Slayter & Lowey (1967), more detail about the shape and size of the heads can be discerned and new information has been obtained about the flexibility of the tail and the head-tail junction. The heads are 190 Å long and wider at their ends than near the junction with the tail; the shape resembles that of a pear. The length is appreciably greater than the generally accepted value for subfragment 1, the proteolytic fragment of myosin. The heads are flexibly attached to the tail and can assume a wide range of tilt angles. Because the point where the two heads join the tail can be identified, the length of the tail, 1560 (±50) Å, can be measured more accurately than formerly. While all parts of the tail are somewhat flexible, sharp bends often occur at a well-defined site 430 Å from the head-tail junction. The demonstration of hinges at the head-tail junction and in the tail provides strong support for H. E. Huxley's (1969) hypothesis for the mechanism of muscle contraction.