190 



<GASE and tropical America, sometimes grown as a shade for 



108. Cacao. The seeds contain a purgative oil. 



CASE Nettle Order (Urticaceae), A large and important 



109. group represented in almost every climate by trees, 

 shrubs, or herbs. Their economic properties are very 

 varied. The order is divided into eight tribes as 

 follows :— 



Tribe I. Ulmeae. — American and European species 

 of which are valuable timber trees ; the English Elm 

 {Ulmus campestris, L.), being especially suited for works 

 in damp situations. Specimens of this wood as well as of 

 the North American Bi^ecies U, fulva, Michx., U. amerir 

 cana, L., and U, racemosa, Thomas, are shown. 



Observe section of the Wellington Elm, the tree under 

 which the Duke of Wellington stood during part of the 

 battle of Waterloo. 



Note also specimens of the beautiful wood of Keyaki 

 of Jsiipan (Zelkova acuminata, Planch.), and boxes made 

 of the wood. 



Tribe II. Celtideae. — Under this tribe are exhibited 

 specimens of wood and bark of various species of Celtis 

 and Trema, 



Tribe III. CannaMneae.—The Hop and the Hemp 

 are alone included in this tribe. 



CASE No. 455. Samples of Hops used by brewers ; the 



110. dried heads of fruit of Humulus Lupulus, L. Remarkable 

 among the great Nettle-tribe for its twining stem. A 

 native of Europe, Russian Asia, and perhaps of England. 

 Cultivated in Germany from the eighth century, and 

 introduced into England under Henry VIII. for the sake 

 of its odorous and resinous cones used in brewing. 



Note also Tallies as used in Hop gardens in Kent and 

 Worcester, and HOP TEA formed of Indian Tea mixed 

 with dried hops. 



No. 456. Hemp ((7anna&/s sa^tm, L.), cultivated in 

 cool climates for its invaluable fibre ; in tropical India, 

 -&C., for the narcotic resin exuded by the leaves and stem. 

 Hemp grows wild in Northern India and temperate Asia. 

 It was cultivated by the Greeks and Romans, but the 

 Egyptians and Hebrews appear to have been unac- 



