THE DATING OF CLAY-PIPES 21 While this simple sequence may serve as a rough guide to place any individual pipe in its correct half-century, bearing in mind the relative scarcity of mid-eighteenth century pipes, in the heyday of snufftaking, say from 1735 to 1780, we can do better than this for most patterns likely to be found. In order to understand the key that follows on pages 23-27, figure 5 may help to indicate the exact meaning of the terms used for the several parts of a pipe, and to show the likely variations of form.