[1]The attempt to work out the structure of the nucleus resulted in a
_false_, but useful, theory that persisted throughout the 1920s. The
great advances in nuclear science in this decade were made in the
light of this false theory and, for the sake of historical accuracy,
they are so presented here. The theory now believed correct will be
presented shortly, and you will see how matters can be changed from
the earlier concept to the later one.