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.
"Watch," Bays the London Farmers' Magazine, "the intelligent vine-grower diligently thinning his grapes, He looks for produce not in seeds or grains (as the corn-grower does), but in pounds of Juice. Now, he may obtain the same total quantity of syrup in his globular fruit, either by having a great number of grapes individually small, or a less number of grapes proportionately large, and, irrespective of increased market value per pound for the finer fruit, he has a potent reason for choosing the latter kind of yield, in spite of the additionally arduous labor it involves in repeated .thinning. The vital power of the vines, he tells you, is not so much taxed in secreting the watery juice as in maturing the reproductive and life-impregnated seeds; and, as a small grape contains as many seeds as a large, one, he husbands the energies and resources of the vines by taking a crop richest in Juice, and soantiest in seeds, thus realizing the greatest value of produce with the least possible exhaustion of the plants bearing it".