The few facts definitely ascertainable are collected by G.
If we answer " Yes " to that question, we pass on from intuitionalism to idealism - an idealism not on the lines of Berkeley (matter does not exist) but of Plato (things A obey an ascertainable rational necessity).
Hegel offers a supposed proof that Time and Space, Matter, Nature, are ascertainable and definable 2 This is Kant's positive refutation of Hume's scepticism.
It is known that the Kafirs occupy the crest of the Hindu Kush eastwards of the Khawak, but how far they extend north of the main watershed is not ascertainable.
By prearrangement, no doubt, uniformity may be obtained in regard to most of the main statistical facts ascertainable at a census, at all events in the more advanced units of the empire, and proposals to this effect were made by the registrar-general of England and Wales in his report upon the figures for 1901.