Abstract
'In the string model of the fermion we consider the physical meaning of the DiracRamond equation and the supergauge conditions for both the free and. the interacting cases, The interaction of the string with external fields is determined in such a way that it is conformally invariant and is compatible with the gauge conditions. Any fermion states have zero norm when the ground-state fermion has zero mass. For this reason we consider a definition of S-matrix elements:' The proof of the absence of ghosts is then reexamined. The 10-dimensional Dirac equation is reduced to the usual 4-dimensional Dirac equation with a mass term. Finally the isospin quantum number is introduced into the string in such a way that all the algebraic relations remain unchanged.
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