The larger display pieces are generally designed and redesigned season by season by pyrotechnists, and are certainly being elaborated and improved. They, however, fall generally into certain classes in the same way as do those given by Ruggieri. His classification is as follows: 1. Stationary fireworks. 2. Fireworks turning vertically. 3. Mixed fireworks or fixed and turning. 4. Fireworks turning horizontally or on a pivot. 5. Built-up pieces turning on a pivot. 6. Cut-out pieces and transparencies. Of these, the last mentioned class are now obsolete: they consisted of transparent and silhouette pictures or designs illuminated from behind. He also includes both simple and compound fireworks in each class, but as the former have already been dealt with they will be ignored here. Class 1. (1) Glorys, fans and “pates d’oie” or goose foot, synonymous with our expression crow’s foot. Glory was a term used also in this country to signify fixed suns, as mentioned above. Fans were cases five or more in number, arranged as the name indicated, and pates d’oie, three similarly arranged. (2) Mosaiques. These are geometrical designs formed by arranging gerbs or fixt on framework, so that their fire forms a symmetrical pattern. The effect is heightened by saxons in suitable positions, and in large devices of this nature, small wheels, also formerly, the now obsolete fixed or five-pointed star. This type includes what are now called “lattice poles,” a series of poles provided with cleats so that the fire of the cases crosses, forming a lattice of sparks; also the more elaborate “carpet piece.” (3) Feux croisés. These were similar in conception to the above, except that the design is circular or based on the circle or wheel form; this type is represented by the “fixt piece” of to-day, which is constructed up to considerable dimensions, the large fixt piece at the Crystal Palace often measuring sixty feet across the fire. (4) Palm Trees. These consist of a framework intended to suggest the form of a palm, provided with cleats to take the cases. (5) Bouquets. These he describes also as a kind of tree different from palm trees; his illustration shows that they were similar to the modern lattice-pole with the difference that the cleats were not symmetrically arranged. To-day the word bouquet is applied to Roman candles arranged in what he called “pates d’oie.” (6) Cascade. This device needs no explanation. He says that Chinese fire is the best composition for such a piece; this remained true up to the introduction of the aluminium into pyrotechny, when the “weird white waterfall” became a feature of the Crystal Palace displays, being 200 feet long and 90 feet high. (7) Decorations in coloured fire. This heading introduces the lancework set piece of to-day.