xx VEGETABLE PHYSIOLOGY 



FIO. PAGE 



40. Section of Dicotyledonous Stems of three ages . . .43 



41. Embryo of Orobus . . . 44 



42. Stratification in Cell- walls . . . 49 



43. Longitudinal Section of Vascular Bundle of Sunflower Stem . 50 



44. Wood-cells, showing Middle Lamella . . . . .51 



45. Section of Epidermis of Leaf ... ... 54 



46. Cork in Twig of Lime . . ,55 



47. Section of a Lenticel . . . 55 



48. Crystals in Wall of Cell of Bast . . . 56 



49. Cystolith of Ficus ... . . 56 



50. Apparatus to show the process of Osmosis ... .60 

 61. Young Vegetable Cells 62 



52. Adult Vegetable Cells ... .63 



53. Cells undergoing Plasmolysis . 64 



54. Rootlets with Root-hairs . . . 73 



55. Root-hair in contact with particles of Soil . . . . 74 



56. Section of Young Root .75 



57. Diagram of Course of Vascular Bundles in a Dicotyledonous Plant 76 



58. Veins of a Leaf . . 77 



59. Ending of a Vascular Bundle in a Leaf ... .78 



60. Intercellular Spaces in Leaf ...... .78 



61. Stomata on Lower Surface of Leaf . . . 80 



62. Apparatus for the Estimation of Root-pressure . . .89 



63. Apparatus to demonstrate Transpiration . . . 94 



64. Section of Blade of Leaf 95 



65. Apparatus to show Dependence of Withering on Loss of Water . 96 



66. Stomata on Lower Surface of Leaf ..... .98 



67. Section of a Stoma 98 



68. Darwin's Potometer 103 



69. Apparatus to show the Suction of Transpiration . . . 105 



70. Ending of a Vascular Bundle in a Leaf ..... 106 



71. Formation of Intercellular Spaces Ill 



72. Intercellular Spaces in Root . .* . . . .111 



73. Intercellular Spaces in Leaf . 112 



74. Section of Leaf of Isoetes ... . . .112 



75. Section of Rhizome of Marsilea . . . . . . . 113 



76. Section of Stem of Potamogeton .114 



77. Section of Stem of Equisetum 115 



78. Section of Stem of Juncus .116 



79. Section of a Lenticel 117 



80. Apparatus to show Continuity of Intercellular Spaces in a Leaf . 118 



81. Section of Leaf of Heath 119 



82. Root of a Leguminous Plant with its Tubercles . . . 140 



83. Section of Blade of Leaf 144 



84. Absorption Spectra of Chlorophyll and Xanthophyll . . 148 



85. Chloroplasts in Cell 150 



86. Section of Leaf of Beta 151 



87. Section of Stem of Equisetum 152 



