Designed, as the Royal Naval Artillery Volunteers have been, for the especial work of coast and harbour defence, it is not necessary that the corps should be very numerous. It certainly need not exceed the numbers of our amateur yachtsmen and oarsmen, for whom the opportunity, now offered, of taking their share in the national defence, is chiefly intended. Enough will have been done, if a brigade can be formed at each of the principal ports, of a strength varying from 200 to 600 men. [Sidenote: The training required.] Having described the general scope of the duties, which would devolve on the Royal Naval Artillery Volunteers, in the event of their being called out for actual service, the nature of the training proposed for the members of the force may be briefly explained. The first consideration must be to familiarise them, to some extent, with the management of boats. This instruction might occupy much time in a corps composed of men, who had never been in the habit of going on the water; but, as the Royal Naval Artillery Volunteer corps is to be recruited in a large proportion from among aquatics, many of their number may be expected to possess this qualification without the necessity for special instruction. The next point to claim attention will be the exercise at the great guns. Here I may venture to affirm, from personal experience, that the naval gun drills have been, in every detail, so carefully considered, the instructors are so completely masters of the subject which they have to teach, and the mechanical appliances are such effectual substitutes for heavy manual labour, that a few days of constant attention will suffice to make a volunteer a useful man in a gun's crew. The class of recruits required for the Royal Navy Artillery Volunteers possess advantages of intelligence and education, far beyond those which the practical seamen can enjoy; and we may anticipate, from the experience already acquired, that they will form some of the smartest gun's crews in any branch of the naval service. There is neither insurmountable difficulty, nor unduly fatiguing labour, in the drill at the great guns. The intricacies could be mastered in a few days, if the volunteers were kept continuously at drill, as they necessarily would be, should they ever be called out for actual service. The essential point in a volunteer corps is to secure men physically capable of doing their work, and who may be confidently relied upon as ready to serve, whenever they may be called upon. The small-arm exercises are still more easily mastered. A rowing man will find himself able to use his cutlass efficiently in a few hours; and, after a couple of days of continuous drill, he would be able to go through the manual and platoon exercises with satisfactory smartness and precision.