I am indebted to Prof. A. Salam for discussions on this problem. In fact, when I presented this paper to him, he showed me a study he had done on the unitary theory of the Sakata model, treated as a gauge, and thus producing a similar set of vector bosons. Shortly after the present paper was written, a further version, utilizing the 8 representation for baryons, as in this paper, reached us in a preprint by Prof. M. Gell Mann.