National Geographic : 1921 Aug
208 THE NATIONAL GEOGRAPHIC MAGAZINE I Ey~ Sim EXAMINING PLANT IMMIGRANTS TO SEE WHETHER THEY ARE HEALTHY More than 1o,ooo naturalized plant citizens of the United States have been brought from every quarter of the world by plant explorers of the Department of Agriculture. All of these plants, as well as commercial importations, are carefully examined for injurious insects and plant diseases. If necessary, such plants are disinfected by fumigation, or destroyed if fumigation cannot be relied upon to eliminate any accompanying pests. A SEARCIl FOR FUNGI AND INSECTS AT A HORTICULTURAL "ELLIS ISLAND" These lilies-of-the-valley roots may neither toil nor spin, but they require patient work on the part of experts from the Office of Plant Introduction to prevent the admission to the United States of undesirable parasites. !