THE CELL Typical cell 53 Changes in a cell undergoing division 55 Origin of multicellular plants 57 CHAPTER II THE EPIDERMIS AND PERIDERM Leaf epidermis 59 Testa epidermis 63 Plant hairs 66 Forms of hairs 67 Papillæ 67 Unicellular hairs 69 Multicellular hairs 72 Periderm 80 Cork periderm 80 Stone cell periderm 85 Parenchyma and stone cell periderm 85 CHAPTER III MECHANICAL TISSUES Bast fibres 89 Crystal bearing bast fibres 90 Porous and striated bast fibres 92 Porous and non-striated bast fibres 96 Non-porous and striated bast fibres 96 Non-porous and non-striated bast fibres 96 Occurrence of bast fibres in powdered drugs 103 Wood fibres 104 Collenchyma cells 106 Stone cells 109 Endodermal cells 116 Hypodermal cells 118 CHAPTER IV ABSORPTION TISSUE Root hairs 121 CHAPTER V CONDUCTING TISSUE