The Balmer-like mass formula and quantization conditions derived from
the first principles have been applied to systematic analysis of the g
ross structure of all known hadronic resonances. These equations are v
ery useful at least for prediction and estimation of the invariant mas
ses of unknown resonances. The correspondence principle between old cl
assical and new quantum theories plays an outstanding role in the inte
rpretation of the results and allows us to go even into fine details.
We have demonstrated that the dimensional analysis, the principles of
similitude and automodelity and the methods of analogy can put some br
idge between the various branches of physics.