There is a department at the Woolwich Arsenal to which we must now return, of which the establishments at Enfield and Waltham Abbey may be considered but outlying offshoots. Beyond the canal, at the extreme end of the ground, lie the establishments devoted to the more dangerous portions of pyrotechnic manufacture, such as the filling of rockets, of friction-tubes, the driving of fuses, &c. These ticklish operations used to be conducted in ill-built sheds in the laboratory square, where a sad explosion took place during the war, and Captain Boxer, determining to reduce the risk of accidents, transferred the whole of them in 1854 to this open space, far away from the neighbourhood of fire. The sixteen houses used for fuse-driving and friction-tube-making are isolated from each other much in the same manner as the incorporating mills at Waltham Abbey: we need not therefore describe them. The rocket manufactory is also so carefully arranged that accidents can rarely happen. The method of driving the composition into these frightfully destructive implements of war was, until lately, not only barbarous but dangerous in the extreme, being forced in by a "monkey," or small pile-driver, worked by eight men. The pressure of water now does the work silently, effectually, and safely. The rocket is so fixed while it is being filled, that in case of an accident the discharge will fly through the roof; grit and iron are as carefully excluded as in the powder mills; open spaces around the buildings are covered with turf and planted with shrubs, and a raised causeway of wood keeps the communications between the different magazines free from all substances likely to produce friction. The visitor may no more enter one of these carefully-guarded buildings with his shoes on than he could walk into the mosque of St. Sophia, at Constantinople, similarly shod. With equal care the process of greasing the bullet end of the small-arm cartridges is carried on in this portion of the Arsenal. For a long time no lubricating material could be found that remained unaffected in all climates--a very important desideratum, considering the manner in which our stores of war are moved about from the depths of arctic waters to the burning summers of the torrid zone. Captain Boxer, however, in a happy moment, thought of the little busy insect that builds a store-house warranted to keep in all temperatures, and adopted bees' wax, which, added to a little fat, makes a compound which answers the purpose perfectly. The cartridges are dipped about an inch deep into a receptacle of this liquid kept fluid by the heat of gas. As we watched the process going on, we could not avoid reflecting from what insignificant causes great events arise, and that a rebellion which well-nigh snatched India from our grasp sprung from this very cauldron seething with "hell-broth thick and slab."