Many of these glasses are engraved with flowers. The rose is so frequent as to give its name to a special type, the “rose glasses.” The rose has often a bud or two, and a butterfly is frequently represented as hovering over the flower. In later specimens the butterfly degenerates into a moth, and finally vanishes altogether. Other flowers engraved on glasses of the same type and period were the Rose of Sharon and the St John’s Wort. Rose glasses, with blue and white twisted stems, are in all probability almost exclusively of English manufacture, and are among the most valuable of the opaque-twisted type. The foreign importations of the period were numerous but, apart from certain patterns of twist, which may be considered exclusively English, the twisting of the Low Countries was distinctly inferior. One type is characteristic of the foreign product. This has a central tube of thin white lines, surrounded by spiral twists. Where the stem is of the baluster type, this central tube, more or less, follows the contour of the stem. _Straight-sided Glasses._--The term “straight-sided” may be used to designate a whole series of glasses, of which the bowls are of the shape of a truncated cone, the narrow end being, of course, downward. In process of time the sharpness of the section at the bottom was more and more rounded until it attained the shape of the ogee curve. The earliest of the straight-sided glasses had bulbed stems, with a shoulder and knop. The better sorts of tavern and household glasses were of this type, the larger specimens being used for wine and punch and the smaller for cordials and strong waters. Two points are worthy of notice: the folded foot was practically invariable, and the diameter of the foot was always substantially greater than that of the bowl, thus ensuring a sound support. The bowls themselves were at first plain. About the middle of the century, however, we find them decorated with conventional flowers and vine leaves, etc., which were gradually replaced by closer and more artistic representations of such natural objects as roses, as a matter of course, lilies of the valley, tulips, and sprays of honeysuckle. Amongst these, however, certain conventional designs held their place, _e.g._ wild roses, St John’s Wort, and other blossoms with large seeded centres, which seem to have impressed themselves strongly upon the imagination of the artists to whom the decoration was entrusted. The bowls were, in very rare instances, fluted.