xviii VEGETABLE PHYSIOLOGY 



FIG. PAGE 



40. Section of Dicotyledonous Stems of two ages 38 



41. Embryo of Orobus 39 



42. Stratification in Cell-walls 44 



43. Longitudinal Section of Vascular Bundle of Sunflower Stem . . 45 



44. Wood-cells, showing Middle Lamella 45 



45. Section of Epidermis of Leaf . . 48 



46. Cork in Twig of Lime . . 49 



47. Section of a Lenticel 49 



48. Crystals in Wall of Cell of Bast 50 



49. Cystolith of Ficus 50 



50. Apparatus to show the process of Osmosis 55 



51. Young Vegetable Cells 56 



52. Adult Vegetable Cells 57 



53. Cells undergoing Plasm olysis . . 59 



54. Kootlets with Koot-hairs 68 



55. Boot -hair in contact with particles of Soil 69 



56. Section of Young Boot 70 



57. Diagram of Course of Vascular Bundles in a Dicotyledonous Plant 71 



58. Veins of a leaf 72 



59. Ending of a Vascular Bundle in a Leaf 73 



60. Intercellular Spaces in Leaf . . . . . . . .73 



61. Stomata on Lower Surface of Leaf 75 



62. Apparatus for the Estimation of Boot-pressure . . . .84 



63. Apparatus to demonstrate Transpiration 89 



64. Section of Blade of Leaf 90 



65. Apparatus to show dependence of Withering on Loss of Water . . 91 



66. Stomata on Lower Surface of Leaf 93 



67. Section of a Stoma 93 



68. Darwin's Potometer 98 



69. Apparatus to show the Suction of Transpiration . . . . 99 



70. Ending of a Vascular Bundle in a Leaf 101 



71. Formation of Intercellular Spaces 105 



72. Intercellular Spaces in Boot 105 



73. Intercellular Spaces in Leaf 106 



74. Section of Leaf of Isoetes 106 



75. Section of Bhizome of Marsilea 107 



76. Section of Stem of Potamogeton 108 



77. Section of Stem of Eqtiisetum . . 109 



78. Section of Stem of Juncus 110 



79. Section of a Lenticel Ill 



80. Apparatus to show Continuity of Intercellular Spaces in a Leaf .111 



81. Section of Leaf of Heath 112 



82. Boot of a Leguminous Plant with its Tubercles .... 134 



83. Section of Blade of Leaf 139 



84. Absorption Spectra of Chlorophyll and Xanthophyll . . . 143 



85. Chloroplasts in Cell 145 



86. Section of Leaf of Beta 146 



87. Section of Stem of Equisetum 147 



