Each of these appliances has required for its successful use the educating of men to use it, and frequently the creation and organization of entirely new branches of the service; an illustration is the radio corps in each of our large ships. At the present time the attitude of officers and of the department itself is so much more favorable to new appliances that a clear probability of a new device being valuable is a sufficient stimulus to bring about the education of men to use it; but a very few years ago many devices were lost to us because they were considered "not adapted naval use." Now we endeavor to adapt them. The present complexity of our material is therefore reflected in the complexity of the organization of our personnel; and as it is the demands of material that regulate the kind of personnel, and as a machine must be designed and built before men can learn to use it, it follows that our personnel must lag behind our material--that our material as material must be better than our personnel as personnel. It may be answered that all our material is first invented, then designed, and then constructed by men; that men create our material appliances (though not the matter of which they are composed), that the created cannot be better than the creator; and that therefore it is impossible for our material to be better than our personnel. But to this objection it may be pointed out that only a very small proportion of our personnel are employed in creating; that most of them are engaged merely in using the material with whatever degree of skill they possess, and that, if a man uses an instrument with perfect skill, he then succeeds merely in getting out of that instrument all that there is in it. A soldier's musket, for instance, is a very perfect tool--very accurate, very powerful, very rapid; and no marksman in the world is so skilful that he can shoot the musket with all the accuracy and speed of which the gun itself is capable. This indicates that the personnel of a navy is harder to handle than the material, and that therefore the most effort is required to be expended on the personnel. The strength of any system depends on the strength of its weakest part; in any organism, human or material, effort is best expended on the weak points rather than on the strong.