_a._ Black Willow (Salix nigra) 89 CATALPA (Catalpa). Section 17. Structural Values. Properties of Woods. Botanical Characteristics of Trees, etc. 90 _a._ Catalpa (Catalpa speciosa) 91 _b._ Catalpa (Catalpa catalpa) 92 SASSAFRAS; MULBERRY (Sassafras), (Morus). Section 18. Historical. Properties of Sassafras Wood. Properties of Mulberry Wood. Botanical Characteristics of Trees, etc. 93 _a._ Sassafras (Sassafras officinale) 94 _b._ Mulberry, Red Mulberry (Morus rubra) 95 BUCKEYE; HORSE CHESTNUT (Aesculus). Section 19. Structural and Botanical Relationship. Localities. Properties and Uses of Wood. 96 _a._ Horse Chestnut (Aesculus hippocastanum) 97 _b._ Ohio Buckeye (Aesculus glabra) 97 _c._ Sweet Buckeye (Aesculus octandra) 98 GUM (Liquidambar, Nyssa). Section 20. Botanical and Structural Relationships. General Properties and Uses of Woods. Botanical Characteristics of Trees. 99 _a._ Sweet Gum (Liquidambar styraciflua) 100 _b._ Sour Gum (Nyssa sylvatica) 101 _c._ Cotton Gum, Tupelo (Nyssa aquatica) 102 HOLLY; BOXWOOD; LIGNUMVITÆ (Ilex), (Buxus Cornus), (Guajacum, etc.). Section 21. Structural and Physical Properties; also Uses of Holly, of Boxwood, and of Lignumvitæ Woods. Sources. Substitutes for Boxwood, _i.e._, Flowering Dogwood, Mexican Persimmon and Rose Bay. Botanical Characteristics of Trees, etc. 103 _a._ Holly (Ilex opaca) 105 _b._ Dogwood (Cornus florida) 106 _c._ Lignumvitæ (Guajacum sanctum) 107 LAUREL (Magnolia, Rhododendron, Arbutus, etc.). Section 22. Application of Name Laurel. Structural Peculiarities and Uses of Several Products. 108 _a._ Mountain Laurel (Umbellularia californica) 109 _b._ Madroña (Arbutus menziesii) 110 PERSIMMON; OSAGE ORANGE; CHERRY (Diospyros), (Maclura), (Prunus). Section 23. Range. Structural Peculiarities and Uses of Persimmon Wood, of Osage Orange Wood, of Cherry Wood. 111 _a._ Persimmon (Diospyros virginiana) 112 _b._ Osage Orange (Maclura aurantiaca) 113 _c._ Cherry (Prunus serotina) 114 TEAK; GREENHEART (Tectona), (Nectandra).