Such are the means of defence and attack possessed by our fleet. There has never yet been anything like a grand engagement between two great iron-clad navies; when that takes place, we shall see what the new naval warfare really is; meanwhile one thing is quite certain--that iron-clads are neither as handy nor as comfortable as the grand old ships of say forty years ago. Sailors in the royal navy have had to exchange the well-lighted, airy lower-decks of the line-of-battle ship for the hot dark 'compartments' of the iron-clad; for oil-lamps, hot rooms, and artificial ventilation, and perhaps the prospect of being battered with monster guns or blown up with torpedoes. This change of conditions may have serious consequences, not contemplated by designers of iron-clads. At present the crews of these vessels have been nearly all engaged as boys, put on board training-ships. They turn out a fine set of young men, but they do not remain in the service. Before they are thirty, most of them have gone, and are engaged in employment on shore, or in yachts, or in ocean steam lines. We believe there will be also a growing difficulty in procuring a good set of officers, including surgeons, for the iron-clads. Young men of good education, with numerous openings for them in civil life, do not like to be immured in dark floating hulks, with the risk at any moment of being helplessly sent to the bottom of the sea. We at anyrate know the fact of two young men trained as surgeons for the royal navy who on these grounds have shrunk from following their intended profession. In short, science may invent ships of overpowering destructive grandeur, but it cannot invent men who will agree to live under conditions of dismal discomfort in these floating dungeons. Such, we imagine, will be found to be weak points in a navy of iron-clads. Nor can we look with indifference on the many instances of disaster in the mere working of these new-fashioned vessels. Explosions and other fatalities follow in pretty quick succession. Furnaces and steam-machinery are constantly going wrong. Shafts and bearers are going wrong. There seems to be such a complication in all departments, that one can have little confidence in matters going quite right in case of that kind of active service involved in absolute warfare. A contemplation of these several contingencies, it must be owned, is far from pleasant.