See the instructive passage in Aristotle, Nic. Eth.
Yet instructive parallels may be found in ancient literatures.
The study of the clan-group as an organization is as instructive here as in other fields.
It may be instructive to contrast this with the case of an infinitely narrow annular aperture, where the brightness is proportional to Jo 2 (z).
In 1827 and the two following years, Cunningham prosecuted instructive explorations on both sides of the Liverpool range, between the upper waters of the Hunter and those of the Peel and other tributaries of the Brisbane north of New South Wales.