Van Mons is supposed to have originated this variety about 1800 as Diel mentioned it among his best pears in 1812. Summer Doyenné was first brought to the notice of American pomologists by William Kenrick, who compiled a description of it as early as 1836. It does not, however, appear to have been introduced until 1843. It was recommended for general culture in the United States by the American Pomological Society in 1852. Tree variable in size, upright, vigorous, very productive; trunk slender; branches slender, slightly zigzag, brownish, overlaid with gray scarf-skin, marked with numerous conspicuous lenticels; branchlets slender, long, light brown mingled with green, the new growth tinged with red, smooth, glabrous except near the ends of the new growth, with numerous raised lenticels. Leaf-buds small, short, sharply pointed, plump, free; leaf-scars with prominent shoulders. Leaves 2-7/8 in. long, 1-1/8 in. wide, thin, leathery; apex taper-pointed; margin finely serrate; petiole 1-3/4 in. long, tinged with pink. Flower-buds small, short, plump, free, singly on very short spurs; flowers showy, 1-1/4 in. across, in dense clusters, 7 to 9 buds in a cluster; pedicels 1-1/4 in. long, slender, pubescent. Fruit ripe in early August; small, 1-1/2 in. long, 1-5/8 in. wide, obovate-obtuse-pyriform, symmetrical; stem 1-1/8 in. long, slender; cavity obtuse, shallow, narrow, slightly furrowed, often lipped; calyx small, closed; lobes separated at the base, short, narrow, acuminate; basin shallow, obtuse, furrowed; skin thin, smooth, tender, waxen yellow, washed or blushed with bright red, deepening on the exposed cheek to crimson; dots numerous, small, russet, obscure; flesh tinged with yellow, fine-grained, tender and melting, juicy, variable in flavor and quality, pleasantly sprightly under favorable conditions; quality variable, good under the best conditions. Core closed, axile, with clasping core-lines; calyx-tube short, narrow, urn-shaped; carpels roundish-ovate; seeds small, narrow, flat, acute. [Illustration: TYSON] TYSON =1.= _Mag. Hort._ =12=:433, fig. 30. 1846. =2.= _Horticulturist_ =1=:433. 1846-47. =3.= _Proc. Nat. Con. Fr. Gr._ 51. 1848. =4.= Hovey _Fr. Am._ =1=:33, Pl. 1851. =5.= Downing _Fr. Trees Am._ 444, fig. 1857. =6.= _Ibid._ 870, fig. 1869. =7.= Leroy _Dict. Pom._ =2=:710, fig. 1869. =8.= Oberdieck _Obst-Sort._ 333. 1881. =9.= Lauche _Deut. Pom._ =II=: No. 95, Pl. 95. 1883. =10.= Ont. Dept. Agr. _Fr. Ont._ 182, fig. 1914.