PLATE 1 THE ONION ROOT 56 PLATE 2 LEAF EPIDERMIS 60 PLATE 3 LEAF EPIDERMIS 61 PLATE 4 TESTA EPIDERMAL CELLS 64 PLATE 5 TESTA CELLS 65 PLATE 6 PAPILLÆ 68 PLATE 7 UNICELLULAR SOLITARY HAIRS 70 PLATE 8 CLUSTERED UNICELLULAR HAIRS 71 PLATE 9 MULTICELLULAR UNISERIATE NON-BRANCHED HAIRS 73 PLATE 10 MULTICELLULAR MULTISERIATE NON-BRANCHED HAIRS 75 PLATE 11 MULTICELLULAR UNISERIATE BRANCHED HAIRS 76 PLATE 12 NON-GLANDULAR MULTICELLULAR HAIRS 78 PLATE 13 MULTICELLULAR MULTISERIATE BRANCHED HAIRS 79 PLATE 14 MULTICELLULAR MULTISERIATE BRANCHED HAIRS 81 PLATE 15 MULTICELLULAR MULTISERIATE BRANCHED HAIRS 82 PLATE 16 PERIDERM OF CASCARA SAGRADA (_Rhamnus purshiana_, D.C.) 84 PLATE 17 MANDRAKE RHIZOME and WHITE CINNAMON 86 PLATE 18 PERIDERM OF WHITE OAK (_Quercus alba_, L.) 87 PLATE 19 CRYSTAL-BEARING FIBRES OF BARKS 91 PLATE 20 CRYSTAL-BEARING FIBRES OF BARKS 93 PLATE 21 CRYSTAL-BEARING FIBRES OF LEAVES 94 PLATE 22 BRANCHED BAST FIBRES 95 PLATE 23 POROUS AND STRIATED BAST FIBRES 97 PLATE 24 POROUS AND NON-STRIATED BAST FIBRES 98 PLATE 25 NON-POROUS AND STRIATED BAST FIBRES 99 PLATE 26 NON-POROUS AND NON-STRIATED BAST FIBRES 101 PLATE 27 GROUPS OF BAST FIBRES 102 PLATE 28 WOOD FIBRES 105 PLATE 29 CATNIP STEM and MOTHERWORT STEM 107 PLATE 30 COLLENCHYMA CELLS 108 PLATE 31 BRANCHED STONE CELLS 110 PLATE 32 POROUS AND STRIATED STONE CELLS 113 PLATE 33 POROUS AND NON-STRIATED STONE CELLS 114 PLATE 34 CINNAMON, RUELLA ROOT, CASCARA and CINNAMON 115 PLATE 35 CROSS-SECTIONS OF ENDODERMAL CELLS OF 117 PLATE 36 LONGITUDINAL SECTIONS OF ENDODERMAL CELLS 119 PLATE 37 HYPODERMAL CELLS 120 PLATE 38 CROSS-SECTION OF SARSAPARILLA ROOT (_Smilax officinalis_, Kunth) 123 PLATE 39 ROOT HAIRS (Fragments) 124 PLATE 40 ANNULAR AND SPIRAL VESSELS 129