Abstract
The quantisation of magnetic flux and the quantisation of electric charge follows from requiring the same invariance properties under time reversal of both classical and quantum systems. The action integral for a line of quantised magnetic flux is the area of the surface traced out in space-time by the motion of the line. It is suggested that the relativistic string of the dual resonance model of hadrons is a line of quantised magnetic flux. Accordingly, quarks have magnetic charge. Assuming quarks of magnetic charge +g, −2g, baryons are composed of three quarks. States of one, two, four or five quarks will not normally occur. An explanation is given of the failure to produce free quarks.
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