In our ballad literature not a little is heard of 'the wooden walls of Old England.' History is so full of exploits by three-deckers and frigates, that one feels as if the general disuse of these engines of naval warfare would lead to national disaster. England, however, does not stand alone in exchanging wooden walls for iron-clads of an entirely new type. All the navies of the world have been thus transformed in the twenty years which have elapsed since our last great war. There are ships of war now afloat which could single-handed meet and defeat the whole fleet that followed Nelson and Collingwood at Trafalgar. These great changes have been brought about by the use of armour-plating, the growth of the guns, the improvement of marine engines, and the adoption of machinery to aid in the working and the fighting of the ship. We remember a few months ago hearing one of our admirals, a man of the old school, talking of naval war. 'In past times,' he said, 'war was all courage and chivalry. What is it now? Cunning and machinery!' And to some extent he was right. Cunning and machinery will play a great part in the naval battles of the future; but of course there must be courage, and iron courage too, behind them, or iron plates and monster guns will avail but little. In the new class of war-vessels, the massive plates are bolted on to iron frames; the only wood is the 'backing' of Indian teak behind and sometimes between them. Oak, so far as beams and planks are concerned, has disappeared from the navy. The 'hearts of oak' are left, however, it is to be hoped, in the brave fellows who happily still man our new navy.