The existence in our mind of certain laws and forms according to which we connect the material supplied to us by our senses, and, secondly, the fact that logical thought cannot be usefully employed without the assumption of a further set of connexions, not logically necessary, but assumed to exist between the data of experience and observation.
Ostensibly a solemn revenge for the burning of Greek temples by Xerxes, it has been justified as a symbolical act calculated to impress usefully the imagination of the East, and condemned as a senseless and vainglorious work of destruction.
The related literature is enormous (see the bibliographies to the special articles); it is indexed annually in Orientalische Bibliographie (Berlin), and is usefully summarized in the Theologische Jahresbericht (Berlin).
Economics, therefore, under modern conditions, is not only a subject which may usefully occupy the attention of a leisured class of scientific men.
3 A succinct notice of the older works on ornithotomy is given by Professor Selenka in the introduction to that portion of Dr Bronn's Klassen and Ordnungen des Thierreichs relating to birds (pp. 5-9) published in 1869; and Professor Carus's Geschichte der Zoologie, published in 1872, may also be usefully consulted for further information on this and other heads.
How would you define usefully? Add your definition here.