Ruffino on the Contingent A Priori

This is a rejoinder of sorts to Marco Ruffino’s critique in his book Contingent A Priori Truths (Springer, Switzerland, 2022) of my own criticism of Saul Kripke’s case for the contingent a priori. A distinction is drawn between knowledge concerning the meter stick S that its length is such-and-such and knowledge concerning S’s length that it is such-and-such.