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Scope and Contents Development of Disease Resistant Varieties of Plants, Jackson, H. S. Address given before the Massachusetts Horticultural Society, March 14, 1908, pp. 123-136.Sorosporium Ellisii Winter, a composite species, Jackson, H. S. Reprinted from the Bulletin of the Torrev Botanical Club, v. 35, 1908, pp. 147-149.A New Pomaceous Rust of Economic Importance, Gymnosporangium Blasdaleanum, Jackson, H. S. Reprinted from Phytopathology, vol. 4, no. 4, August, 1914, pp. 260-270, plates...