I wish to say something today regarding the theoretical basis of the fission theory of binary stars. For many years it has been thought to be one of the established conclusions of astronomy that at least the close binaries have resulted from the fissional break-up of single massive stars, and theories of stellar evolution have regarded this as one of the settled issues that must be incorporated in a general theory accounting for all types of stars.

In discussing the basis of the fission theory it will not be my concern so much to consider actual stars, but only the theoretical stars as postulated in the dynamical formulation of the fission theory.