In the factory the blocks are sorted and then undergo a sweating process in steam vats for ten to twelve hours. This steaming gives the wood the familiar brown-yellow tint of the natural briar root uncolored. After sweating the blocks are sent to the drying room as all traces of moisture must be removed. This usually takes several months. For pipe making the workman selects his block and roughly trims it to size. It is then placed in the frazing machine. This usually has three cutters revolving at very high speed, making several thousand revolutions per minute. The center cutter shapes out the block and the outer knives cut away the wood on the outside so as to form the block roughly into the shape of a pipe bowl and stem. This is then placed in a special lathe for cutting irregular forms. It is usual to fit in it a metal pattern of the particular shape chosen for the pipe. A circular cutting tool is set in motion and the briar block, which turns with the metal pattern, is mechanically cut to the exact shape of the pattern. After cutting, the pipe passes to the sandpapering machines where both inside and outside are thoroughly treated, and it gets a first polishing or smoothing on a pumice stone wheel. The next process is the boring of the stem which is done in a drilling machine by a steel wire having a cutting top rapidly turned by a lathe. The thread on the end of the stem for the mouthpiece is formed by a special machine. The pipe is then ready for polishers and finishers. It is first sandpapered four times, twice with rough and twice with fine on revolving wheels. Unless the wood is to be left its natural color, it is dropped into a vat of stain until it acquires the color desired. After drying it is ready for "buffing." A "buff" is a wheel made of many layers of cloth, leather, etc., which revolves very rapidly. For pipe buffing these buffs are usually Tripoli buff, sheepskin buff, muslin and cotton flannel buff. The Tripoli takes off any sediment held by the edges of the grain. The sheepskin buff burns the color fast into the wood. The muslin and cotton bring out the grain and gives the wood its final delicate lustre and finish, which are done when the stem and mountings have been put on. The pipes are then ready for final stamping with name and packing. The process is much the same with all other hard woods. Pipe factories are found in most countries. French briar pipes are justly celebrated, but the American pipes are better made. Within recent years calabash has come into vogue to a large extent as a pipe making material. The calabash is a South African squash and has a special softness of flavor. The curved stem end of the calabash is used, being lined with plaster of Paris, and quite a large trade has sprung up in South Africa in growing calabash for the pipe trade, the principal point being Cape Town. THE PIPE STEM