xviii VEGETABLE PHYSIOLOGY 



FIG. 1'AGE 



39. Section of a Lenticel . . . . ' . . ' .'..,'.. 34 



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 . . f . . .. . . . . . 50 



50. Apparatus to show the process of Osmosis . . . . .55 



51. Young Vegetable Cells . ' . 56 



52. Adult Vegetable Cells . . > . . . , . . 57 



53. Cells undergoing Plasmolysis . ...... . . ' . . 59 



54. Kootlets with Koot-hairs - . .68 



55. Boot-hair in contact with 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. Section of Blade of Leaf . . ' . 73 



61. Stomata on Lower Surface of Leaf . 75 



62. Apparatus for the Estimation of Root-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 . . ... ' V . . 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 Koot . ' . . . ' . 105 



73. Intercellular Spaces in Leaf ~. . . . . . , . 106 



74. Section of Leaf of Isoetes . . . .^ . . . .106 



75. Section of Rhizome of Marsilea . . . . , . . > . 107 



76. Section of Stem of Potamogeton . -. V ~- : . . -. . 108 



77. Section of Stem of Equisetum . . - . .... 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 . Ill 



81. Section of Leaf of Heath . .... . . . . . . 112 



82. Apparatus to show the Absorption of Oxygen by a Green Plant . 119 



83. Apparatus to show Exhalation of Carbon Dioxide by Germinating 



Seeds . . ...... 121 



84. Root of a Leguminous Plant with its Tubercles .... 148 



85. Section of Blade of Leaf . . 153 



86. Absorption Spectra of Chlorophyll and Xanthophyll . . . 157 



