Theory of Parallels. The proof of Euclid's axiom looked for in the
properties of the Equiangular Spiral. By Lieut-Col. G. Perronet
Thompson.[721] The same, second edition, revised and corrected. The
same, third edition, shortened, and freed from dependence on the theory
of limits. The same, fourth edition, ditto, ditto. All London, 1840,
8vo.
To explain these editions it should be noted that General Thompson rapidly
modified his notions, and republished his tracts accordingly.