amounts to regarding the plane, in which the curve with a singular point lies, as a single-valued image of a cubic surface, by which the curve is transformed into a space curve, and the latter is projected into another plane by means of a sufficiently general \[projection\] point. In this formulation I am familiar with the Ansatz through Clebsch, who communicated it to me orally in the fall of 1869. I mention this only because I have especially in recent times often appealed to this in my courses and lectures. The readers of the Annalen will have no less reason to be thankful to Mr. Bertini for his detailed presentation.[^20]

This was the note that Coolidge mentioned in attributing to Clebsch the theorem stating that every algebraic curve can be birationally transformed to another having only double points as singularities [@Coolidge1931 212]. Oddly enough, Coolidge seems to have overlooked the nearly contemporaneous note that Noether, acting on Klein’s suggestion, added to his report. This contains the main substance of the passage from Klein’s letter from 1869, as given above. Noether placed this as a footnote to a sentence stating that [@Noether1871] gave the first (incomplete) proof for resolving the singularities 