Abstract
A theory is presented for the viscosity of rodlike molecules in solution. It does not use the diagonalization approximation of the Oseen tensor and improves the Riseman and Kirkwood theory. It is found that the diagonalization approximation amounts to reducing the effects of the hydrodynamical interactions between the segments of the molecules. A new technique is introduced to reduce the problem to an integral equation, of which the solution follows Ullman, who corrected Riseman and Kirkwood and Kirkwood and Auer.

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