INDEX. 



205 



Thick-walled cells, 12, 13. 



Thymus (Gr. " thyme"), oil of the, 47. 



Tilia (Lat. " the lime tree "), 27, 42. 



Tissues of plants, 5 et seq. ; cellular, 8 ; variety 

 of, 18 et seq. ; vascular, 25 27 ; unity of de- 

 sign in the, 28. 



Torula cerevisiae (Lat. torvt a bed, and cerevisia 

 ale), cells of the, 8, 10. 



Tous les mois (Fr. " every month"), starch cell 

 of the, 35, 36. 



Tracheae of insects (Gr. trachea the windpipe), 

 similar to the spiral vessels of plants, 27. 



Trachenchym (Gr. trachea, and enchyma injec- 

 tion), the vascular tissues, 25. 



Tradescantia virginica (in honour of John Trade- 

 Kant, gardener to Charles I. ; and Lat. " vir- 

 gin-like "), hairs of the, 67. 



Trees, woody fibre the cause of their stability, 

 21 ; their component parts, 74 ; various repre- 

 sentations of, 74; sections presenting the 

 different parts, 75 ; sections showing their 

 annual growth, 81, 85 ; immense size of, 82 ; 

 their great longevity, 83 ; cellular structure of, 

 84, 85 ; various sections of, ib. See Stems. 



Triandria (Gr, treis three, and andres males), 

 Class III. of Linnaeus, 152, 154; order of, 153 

 et passim. 



Trigynia (Gr. treis, and gyne a female), order of, 

 153 et passim. 



Triticum (Lat. " wheat "), 56. 



Tuber of plants, 71. 



Turmeric, a vegetable dye, 54. 



Turnip, vegetable secretion of the, 32. 



Turnip-seed oil, a vegetable secretion, 45. 



Turpentine, a resinous secretion, whence ob- 

 tained, 48. 



TT 



Ulmus (Lat. " tke elm tree"), pores and fibres 

 of the, 17. 



Umbel (Lat. umbellaa. fan) of inflorescence, 107, 

 108. 



Umbellales, 192. 



Umbilicaria pustulata (Lat. umbilicus the nave, 

 andpustulata blistered), a vegetable dye, 54. 



Unguis of the petal (Lat. " a claw "), 114. 



Urceolus of inflorescence (Lat. " a little water- 

 pitcher "), 109. 



Urn mosses, 143, 175. 



Urtica, the stinging nettle, 182. 



Urticules, 188. 



V 



Vallisneria spiralis (frrm Antonio Valesneri, and 

 Lat. spiralis spiral), circulation in the, 15. 



Valonia (an acorn), tannic acid secreted from, 50. 



Vascular structure of endogenous steins, 88 ; ita 

 uses, 89. 



Vascular tissues, 2527. 



Valeria Indica (in honour of Abraham Peter* 



and Lat. " Indian"), Pliny tallow, 46. 

 Vegetable butters, tallow, and wax, 46. 

 Vegetable dyes, 54. 

 Vegetable secretions, 3155. 

 Venation of leaves, 93, 94. 

 Venus' fly-trap, sensitiveness of the, 4. 

 Vine, section of its stem, 7 ; twining stem of the, 72. 

 Violet, placentae of the, 128. 

 Violales, 189. 



Viscum album (Lat. " the misletoe berry "), 9. 

 Volatile oils, vegetable secretions, 47. 



W 



Walnut, spiral vessels of the, 26; chambered pith 



in the, 76. 



Water-beetle, trachea of the, 27. 

 Water-lily, stamens and petals of the, 114. 

 Water-plant, milk vessels of the, 29. 

 Wattle-tree, tannic acid obtained from the, 50. 

 Wax, vegetable secretions of, 46. 

 Wheat, starch cells of, 35, 39 ; silicious cuticle 



from its husk, 56. 

 White, one of the principal colours in vegetables, 



53. 



Whorl of leaves surrounding the stem, 100. 

 Whorls, their inflorescence, 112. 

 Wigandia urens (in memory of John Wigand, a 



Bishop of Lithuania; and Lat. "burning"), 



poisonous hair of the, 67. 



Willow, ducts of the, 27 ; catkins of the, 105, 106. 

 Wood, the various parts formed in exogenous 



stems, 79; its modes of growth, 80, 81, 85. 

 Wooded stems, their varieties, 71, 73 et seq.; 



divided into two great classes exogenous, 75 ; 



and endogenous, 86 which see. 

 Woody fibre, or tissue, 18 ; two kinds of, 19 ; 



plain and glandular, 19 ; various illustrations 



of, 19 ct seq. ; the chief organ of circulation, 



20 ; gives stability to the tree, 21 ; uses of the, 



20, 21 ; its size, 24 ; of endogens, 88. 

 Wool, fibre of, illustrated, 23. 



Xyridales (Gr. xyros acute, like rushes), 187. 



Yeast plant, cells of the, 8, 10. 



Yellow, one of the principal colours in vege- 

 tables, 53. 



Yellow gum, whence produced, 49. 



Yew, spiral fibres of the, 20. 



Yucca dulce (the name in St. Domingo, and Lat. 

 dulce sweet), the tapioca plant, 32. 



Y. gloriosa, stomata of the, 62. 



z 



Zea Mays (Gr. zao to nourish, and Ind. maixf)' 

 Indian corn, 45 ; stomata of the, 62. 



