Now the need of supplying enough men to operate successfully any instrument or mechanism is absolute, for the reasons that the number of things to be done is fixed, and that an insufficient number of men in the ratio for instance of 9 to 8 may mean a falling off in the output of the machine much greater than in the ratio of 9 to 8. A simple illustration may be taken from the baseball game; for it is obvious that the output of a baseball team, in competition with other teams, would fall off in a much greater ratio than of 9 to 8, by leaving out one member of the nine. Another illustration, or rather an analogy, may be found in machinery made of rigid metal--say a steam-engine; for the omission of almost any part in an engine would entirely stop its operation. Not only, however, must we see that the number of personnel parts is sufficient, we must see that they are correctly divided among the various material parts; otherwise there will be too many in one place and too few in another; and while it is better to have too many men than too few, too many men prevent the attainment of the maximum effect. The effect of having too few men, however, is not merely in limiting the effectiveness of the output of the machine; for, if carried to a considerable degree, it prevents due care of the material parts themselves, and causes those material parts to deteriorate. This deterioration may take the form of actual wasting away as by rust; but even if the deterioration does not advance so far as actual wastage, it may easily, and often does, advance to the stage where, although not evidenced by visible rust or by any other indication, so long as the mechanism is not operated at its normal rate, it declares itself very clearly as soon as the mechanism is tried in service. For this reason, all mechanicians realize that it is better for every mechanism not to lie idle, but to be used considerably, though, of course, without being forced unduly. Not only also must the personnel be sufficient in number and correctly divided, it must be organized in such manner that the personnel itself will have the characteristics of a machine, in the sense that each unit will be so placed relatively to the hope of reward and the fear of punishment, that he will do his allotted tasks industriously; that he will have the place in the organization for which his character and abilities fit him, and that he will be given such duties and exercises as will fit him more and more for his position, and more and more for advancement to positions higher.