dragon's blood: a dark red resinous substance derived from various trees and used in photoengraving
gum: any of various substances (soluble in water) that exude from certain plants; they are gelatinous when moist but harden on drying
old man of the mountain: whitish hairy plant with featherlike leaves and a few stout stems each bearing an especially handsome solitary large yellow flower head; mountainous regions north central United States