In nearly all navies and armies, until the recent enormous increase in all kinds of material took place, the work of getting a navy ready for war in personnel and material was comparatively simple. This does not mean that it was easier then than now; because the facilities for construction, transportation, communication, and accounting were much less than now; but it does mean that the actual number of articles to be handled was much less, and the number of kinds of articles was also much less; and it also means that the various mechanical improvements, while they have facilitated construction, transportation, communication, and accounting, have done so for every nation; so that none of the competing navies have had their labors expedited or made less. On the contrary, the very means devised and developed for expediting work is of the nature of an instrument; and in order to use that instrument successfully, one has to study it and practise with it; so that the necessity for studying and practising with the instrument has added a new and difficult procedure to those before existing. Fifty years ago the various mechanisms of naval warfare were few, and those few simple. In our Navy Department the work of supplying those mechanisms was divided among several bureaus, and each bureau was given the duty and the accompanying power of supplying its particular quota. The rapid multiplication, during the past fifty years, of new mechanisms, and new kinds of mechanisms; the increased expense of those mechanisms compared with that of former mechanisms; the increased size and power of vessels, guns, and engines; the increased size and complexity of the utilities in navy-yards for handling them; the necessity for providing and using means and methods for despatching the resulting "business" speedily, and for guarding against mistakes in handling the multiplicity of details--the increase, in brief, in the number, size, and kinds of things that have to be done in preparation, has brought about not only more labor in doing those things by the various bureaus assigned to do them, but has brought about even more imperiously the demand for means whereby the central authority shall be assured that each bureau is doing its work. And it has brought about more imperiously still a demand that a clear conception shall be formed first of what must be done, and second of the maximum time that can be allowed for doing it.