Herbarium material does not, indeed, allow one to extrapolate safely: what you see is what you get; what you get is classical alpha-taxonomy which is, very largely and for sound reasons, in disrepute today.

None but those who have experienced them can conceive of the enticements of science.

‘You must come and dine with us some night. Tuesday? Are you disengaged Tuesday?’

Let us return to the hypothesis that generated the paradox: All nonblack things are nonravens.