Thyme Foliage of _Thymus vulgaris_ Southern Europe. Caraway Fruit of _Carum Carui_ Europe. Caper Seeds of _Capparis spinosa_ Southern Europe and Asia. This brief review of what the plant world provides us with in the shape of foods, beverages, fibers, drugs, rubber, spices, and tobacco, does not begin to tell us what man’s debt to plants really is. Thousands of plants, used by natives all over the world, may well provide future generations with unsuspected sources of plant products. No mention has been made of timbers nor all the forest products, except paper, which in the aggregate total an enormous sum. Perhaps no better idea of the tremendous value of plants, of the absorbing interest their utilization has always had for man, can be gained than to refer the reader to incomparably the best book on the subject, so far as tropical plants are concerned. Sir George Watt, in his “Dictionary of the Economic Products of India,” a book of several volumes, most of which deals with plants, has left an imperishable record of man’s struggles to tame the wild plants of the forest to his needs. A few more economic plants not yet noted are listed below, and with this our account of plants as they are used by man must close: PLANT PRODUCT DERIVED FROM THE NATIVE OF Absinthe Foliage of _Artemisia absinthium_ Europe. Brazil nut Seeds of _Bertholletia excelsa_ Tropical S. America. Camomile Flowers of _Anthemis nobilis_ Europe. Cassava Roots of species of _Manihot_ Tropical America. Water chestnuts Fruits of _Trapa natans_ Southern Europe. Cohune nut Fruits of _Attalea Cohune_ Central America. Cork Bark of _Quercus Suber_ Southern Europe and northern Africa. Gamboge resin Stems of species of _Garcinia_ Southeastern Asia. Gum arabic Exudation of species of Tropical Asia and _Acacia_ Africa. Hops Female flowers of Eastern Europe. _Humulus Lupulus_ Indigo Whole plant of India. _Indigofera tinctoria_ Mushroom Whole plant of Temperate regions. _Agaricus campestris_ Teak Wood of _Tectona grandis_ Southeastern Asia. Japanese varnish or lacquer Sap of _Rhus vernicifera_ China. CHAPTER VI GARDEN PLANTS