Leaves numerous, four and one-half inches long, two and one-fourth inches wide, folded upward, obovate to long-elliptical, thin; upper surface medium green, slightly rugose; lower surface light green, faintly pubescent; apex acute, base abrupt; margin coarsely and doubly serrate; petiole about one and one-half inches long, tinged with red, with a few hairs, with from one to four reniform, reddish glands, usually on the stalk. Buds large, pointed, plump, free, arranged singly as lateral buds or in clusters variable in size on short spurs; leaf-scars prominent; season of bloom intermediate; flowers white, one and three-eighths inches across; borne in scattering clusters, in ones, twos or threes; pedicels one and one-fourth inches long, glabrous, greenish; calyx-tube tinged with red, campanulate, glabrous; calyx-lobes with reddish tinge, broad, acute, glabrous within and without, reflexed; petals roundish, entire, nearly sessile, with a shallow notch at the apex; filaments one-half inch long; pistil glabrous, shorter than the stamens. Fruit matures late; about three-fourths of an inch in diameter, cordate; cavity wide, flaring; suture shallow, indistinct; apex slightly pointed, with a small depression at the center; color purplish-black; dots numerous, small, dark russet, inconspicuous; stem slender, one and one-fourth inches long, adherent to the fruit; skin thin, tender, adherent to the pulp; flesh dark red, with dark colored juice, very meaty, crisp, mild, somewhat aromatic, sweet; of good quality; stone clinging, longer than wide, ovate, flattened, with smooth surfaces, somewhat marked with a reddish tinge. DOUBLE GLASS _Prunus avium_ × _Prunus cerasus_ 1. Truchsess-Heim _Kirschensort._ 440-451, 487-490, 689. 1819. 2. Dochnahl _Führ. Obstkunde_ =3=:51, 52. 1858. 3. _Ill. Handb._ 163 fig., 164. 1860. 4. _Mich. Hort. Soc. Rpt._ 329. 1888. 5. _Ia. Hort. Soc. Rpt._ 80. 1890. 6. _Can. Exp. Farm Bul._ =17=:7. 1892. 7. Budd-Hansen _Am. Hort. Man._ =2=:274. 1903. _Amarelle Double de Verre._ 8. Mortillet _Le Cerisier_ =2=:197-201, fig. 55. 1866. _Great Cornelian._ 9. Hogg _Fruit Man._ 299. 1884. _Glass._ 10. _Ia. Sta. Bul._ =73=:70. 1903. Double Glass is a Duke, a hybrid more nearly resembling the Sweet Cherry than the Sour Cherry. The trees grow remarkably well in nursery and orchard and their behavior so pleased growers when the variety was brought to notice that it became for a time quite the vogue. But the trees turned out to be unproductive and the cherries so mediocre that the variety rapidly passed through its heyday of popularity. The fruits are curiously marked, the suture being so deep as to make them appear double--hence the name. The variety has no value where sweet sorts are hardy but possibly might find a niche somewhere in regions where a more tender Sweet Cherry cannot be grown.