Arbor Day
a day set apart to encourage the voluntary planting of trees by the people. The custom was inaugurated by the Nebraska State Board of Agriculture in 1874, which recommended that the second W Wednesday in April annually be designated as Arbor Day, and that all public school children should be urged to observe it by setting out young trees. The custom has since been The extended, till now nearly every State and Territory in the country has set apart one day by legislative enactment, or otherwise, for this purpose. ceremony usually consists of planting be urged to observe it by setting out young trees. The custom has since been extended, till now nearly every State and Territory in the country has set ARC ARBORICULTURE. See FORESTRY, of public or other school buildings. In Canada the first Friday in May is celebrated as Arbor Day. ARBOR VITÆ, literally the tree of well known life. (1) In botany, a name given to the trees belonging to the coniferous genus thuja. T. occidentalis, or American arbor vitæ, is a a dendriform arrangement which appears and valued evergreen. (2) In anatomy, in the medulla of the brain when the cerebellum is cut through vertically.