35. The secondary earth-works would either be armed at once, upon the completion of the _enceinte_, or they might be supplied with guns and ammunition from the main permanent works when occasion might require. In the latter case, their cost would be very trifling, as it would not be necessary to construct permanent magazines or stores. 36. These two sets of works having been completed, it would then merely remain to have the spaces of ground between the several forts carefully considered, with a view to their occupation by a series of smaller works, either enclosed or open to the rear. The latter might in this case be left to be undertaken upon the menace of attack. 37. We should then have London surrounded by a series of strong points of resistance, consisting of chains of detached works, with large intervals between them, through which our regular and irregular troops might advance and retire, and act with a perfect certainty of success. 38. As to the garrisons of the permanent works; we have the Artillery at Woolwich, who would garrison their own fort at Shooter’s Hill, and thus be on the spot to assist in the armament of the secondary works. 39. Now that we have given up the idea of employing our troops as police, we may surely abolish a large proportion of our London barracks, and give the Guards the benefit of suburban quarters. By this means we should do much towards improving the health of the troops, and the sale of the ground on which many of the present barracks are built would go far towards supplying the cost for the construction of those now proposed. 40. As the presence of a considerable strength of engineers would be necessary in the construction of the various secondary works, it would be advisable that one of the large forts should be garrisoned by this force. This would, perhaps, be best accomplished by the removal of our School of Military Engineers from Chatham; and it would be most conveniently located at Wimbledon, where the necessary waste ground could be obtained for practice in earth-works, while the Thames at Richmond would be sufficiently close for practice in hydraulic works and in pontooning. Moreover, the entire force round the metropolis would be able to avail themselves of this additional means of military education: indeed the engineers themselves, however learned or scientific they may be, would be none the worse for being placed within nearer reach of the various meetings of learned and scientific societies which are always taking place in the metropolis.