Comments on: Higgins: “Closure in crystal size distributions (CSD), verification of CSD calculations, and the significance of CSD fans”

Higgins found that the slope and intercept of crystal size distribution (CSD) are automatically correlated with each other when the crystal content is constant, but he failed to make the necessary conclusion that even if the crystal content is not constant, the slope and intercept are still automatically correlated, as shown by his example of Mt. Taranaki. CSD analysis in its present form is fundamentally flawed not only because of its automatically correlated slope and intercept but also because crystal content, together with crystal shape factor, is the only hidden information we can recover from CSD plots.