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.
I inclose a few specimens of a seedling cherry which I believe will prove valuable. The original tree, of some age, stands on the property of Mr. G. W. Zahm, in the city of Lancaster, Pa.; the property was formerly owned by Mr. Hensel, and hence the name of "Hensel's Early" has been given to it. Mr. Zahm informs me that in ordinary seasons this cherry begins to ripen about the 5th of June, or a few days before Knight's Early Black. The tree is of moderate growth, but very hardy, a constant and great bearer; had a full crop this year when nearly all other kinds to a great extent failed, in consequence of the unfavorable weather just at the time of blooming. It is not disposed to rot. Mr. Zahm thinks it worthy of extensive cultivation, and if you think so also from this description, a notice of it in your journal may make it known. Mr. Zahm, who is a zealous amateur fruit-grower, will cheerfully furnish grafts to such as wish to try it. I inclose Mr. Zahm's note to me. Very respectfully yours, W. L. Dlffenderffer. New Holland, Penn., June 23, 1867.
Lancaster, June 24, 1867. Dr. Diffenderffer - Sir: The cherries I send you are not a fair specimen of the fruit at all, they are from the inside of the tree - all others are gone. I have taken fruit off the same tree three inches in circumference. The tree is a moderate grower and very prolific - an accidental seedling named Hensel's Early Seedling.
Yours, G. W. Zahm.