In patriotic duty bound, the Cambridge of Newton adhered to Newton's fluxions, to Newton's geometry, to the very text of Newton's Principia; in my own Tripos in 1881 we were expected to know any lemma in that great work by its number alone, as if it were one of the commandments or the 100th Psalm.
.... Finally, in the earlier section of the Tripos Examinations (officially described as "qualifying for honours", commonly known as "the three days"), there was a rigid rule against the explicit use of a differential coefficient and of an integration-process: we might substitute x+h for x and subtract, dodging onwards to the satisfaction of the examiner; we might use a Newton curve, if we could devise it, to effect a quadrature; but never might we use d/dx or the ∫-sign of integration which were taboo.
A R Forsyth, Old Tripos Days at Cambridge, The Mathematical Gazette, Vol 19, No 234, July1935 (at JSTOR, unfortunately)
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