almost all food, as it comes from the hands of the agriculturist, is nothing more than material for the occupation of the baker or the cook.
§ 4.The second kind of indirect labour is that employed in making tools or implements for the assistance of labour. I use these terms in their most comprehensive sense, embracing all permanent instruments or helps to production, from a flint and steel for striking a light, to a steam ship, or the most complex apparatus of manufacturing machinery. There may be some hesitation where to draw the line between implements and materials; and some things used in production (such as fuel) would scarcely in common language be called by either name, popular phraseology being shaped out by a different class of necessities from those of scientific exposition. To avoid a multiplication of classes and denominations answering to distinctions of no scientific importance, political economists generally include all things which are used as immediate means of production (the means which are not immediate will be considered presently) either in the class of implements or in that of materials. Perhaps the line is most usually and most conveniently drawn, by considering as a material every instrument of production which can only be used once, being destroyed (at least as an instrument for the purpose in hand) by a single employment. Thus fuel, once burnt, cannot be again used as fuel; what can be so used is only any portion which has remained unburnt the first time. And not only it cannot be used without being consumed, but it is only useful by being consumed; for if no part of the fuel were destroyed, no heat would be generated. A fleece, again, is destroyed as a fleece by being spun into thread; and the thread cannot be used as thread when woven into cloth. But an axe is not destroyed as an axe by cutting down a tree: it may be used afterwards to cut down a hundred or a thousand more; and though deteriorated in some small degree by
