And with regard to practical matters, and more especially the modern production of wealth, the case is just the same. No one has illustrated more luminously than Herbert Spencer himself the multitudinous character of the knowledge which modern production necessitates; and no one has insisted with more emphasis than he that one of the rarest faculties to be met with among human beings is the faculty, as he expresses it, of "apprehending assembled propositions in their totality." It would be difficult to define better in equally brief language the intellectual aspect of that composite mental equipment which distinguishes from ordinary men the monopolists of business ability. It is precisely by apprehending a multitude of assembled propositions in their totality--mathematical, chemical, geological, geographical, and so forth--by combining them for a definite purpose, and translating them into a series of orders which organised labour can execute, that the intellect of the able man gives efficiency to the industrial processes of to-day. In addition, moreover, to his purely intellectual faculties, he requires others which, in their higher developments, are no less rare--namely, a quick discernment of popular wants as they arise or an imagination which enables him to anticipate them, an instinctive insight into character which enables him to choose best men as his subordinates, promptitude to seize on opportunities, courage which is the soul of promptitude, and finally a driving energy by which the whole of his moral and intellectual mechanism is actuated. As for "the aggregate of conditions out of which he has arisen," or the aggregate of conditions which surround him, these are common to him and to every one of his fellow-countrymen. They are a landscape which surrounds them all. But aggregates of conditions could no more produce the results of which, as Herbert Spencer admits, the able man is the proximate cause, unless the able man existed and could be induced to cause them, than a landscape could be photographed without a lens or a camera, or a great picture of it painted in the absence of a great artist.