The bag and the string: Are they opposed?

The Cornell potential is under certain conditions converted to an effective potential which is suggestive of the bag model once all spin degrees of freedom of a quark driven by this static field have been integrated out. We argue for the view that such conditions arise from a quark Q   moving in a relativistic mean field generated by two quarks Q′Q′ and Q″Q″, which together with Q   form a nucleon QQ′Q″QQ′Q″, and the nucleon QQ′Q″QQ′Q″ is a constituent of some nucleus. This view opens up a new avenue of attack on the problem of saturation of the nuclear force.