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The intro to Dirac's paper reads: Quantised Singularities in the Electromagnetic Field. By P. A. M. Dirac, F.R.S., St. John’s College, Cambridge. (Received May 28, 1931.) § 1. Introduction. The steady progress of physics requires for its theoretical formulation a mathematics that gets continually more advanced. This is only natural and to be expected. What, however, was not expected by the scientific workers of the last century was the particular form that the line of advancement of the mathematics would take, namely, it was expected that the mathematics would get more and more complicated, but would rest on a permanent basis of axioms and definitions, while actually the modern physical developments have required a mathematics that continually shifts its foundations and gets more abstract.