Key points are not available for this paper at this time.
As was shown in the previous paper, it would have a very important meaning for the formation of the future theory of elementary particles to decide whether there are interactions of the second kind in the nature or not. In this paper, we shall first look for generally those types of fields which may have the interactions of the first kind, and then discuss whether the model of the mesons can be explained by means of these fields with interaction of the first kind only.
H. Umezawa (Thu,) studied this question.