This section is from "The Horticulturist, And Journal Of Rural Art And Rural Taste", by P. Barry, A. J. Downing, J. Jay Smith, Peter B. Mead, F. W. Woodward, Henry T. Williams. Also available from Amazon: Horticulturist and Journal of Rural Art and Rural Taste.
The tree is a pretty strong grower, with stout smooth shoots. Fruit very large, shaped more like a Peach than a Plum, being usually wider than its depth; regularly formed, roundish, much flattened at both ends; suture shallow, but strongly marked; apex much depressed, with a punciured mark at the point. Skin, light brownish-red, nearly a salmon color in the lightest portions, sprinkled with obscure dark specks, and covered with a delicate pale bloom. Stalk very short, rather stout, set in a shallow narrow cavity. Flesh pale yellow, a little coarsegrained, but juicy and of pleasant sprightly flavor when fully ripe; it separates freely from the stone. Stone nearly round, very flat, and much furrowed. Ripe from the 20th to the last of July, It is certainly the largest early Plum, and is well worthy of cultivation. A moderate hearer".