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systems (which differs widely in the examples mentioned here), but it seems to develop when a certain proportion of the " edge " atoms or groups is removed from the condensed aromatic structures by pyrolysis (see also Waters 1961). These groups act as barriers to the movement of current carriers and in the earlier stages of pyrolysis their progressive removal produces an increasing freeradical concentration. When a certain proportion of the groups has been removed the ring clusters can approach each other more closely and, with further pyrolysis, pairing can occur between localized o-electrons of the free radicals and x-electrons of adjacent aromatic systems. The rate of pairing must become greater than the formation of fresh broken bonds, since the overall effect is to decrease the free-radical concentration. The increasing number of holes thus produced in the x-bands leads to an increasing excess-hole type conductivity.

The Heat of Mixing for Binary Mixtures of Pyridine with Hydrocarbons