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 Philadelphia experiments of General Pleasanton upon the organic influence of the violet ray have been repeated in France, and M. A. Poey has communicated to M. Elie de Beaumont, a letter on the influence of violet ray upon the growth of the vine, pigs and ' cattle.
Robert Buist, Sr., of Philadelphia, endorses the blue glass theory from his own successful experience. In a communication to Tilton's Journal of Horticulture, he says he "applied a coating of Prussian blue paint, six inches wide, up the center of each row of panes; the result was electric, and the plants assumed their beautiful green color in a few days, and the trusses of bloom came to maturity in a few days." The glass houses had formerly been used to grow geraniums for bedding purposes, but they had lost their color every year about the first of April. Now they were completely rejuvenated.
All who possess orchard houses should procure a plant or two of this myrtle. It fruits profusely, and possesses the most delicious flavor imaginable. In general appearance it bears a close resemblance to the common myrtle (Myrtus communis). It may be propagated freely from cuttings of the young wood in a moderate heat. - Gardener's Weekly.