XIV LIST OF ILLUSTRATIONS. 



FIG. PAGE 



26 Cells of a date-stone in section 61 



27 Transverse section through a ridge on the stem of Clematis 64 



28 Transverse section through a branch of the Oak . . 66 



29 Transverse section of an Oak, showing the annual rings 



and the medullary rays 67 



30 Transverse section through the wood of the Lime-tree 



showing the annual rings 69 



31 Diagram illustrating two types of longitudinal section . 70 



32 Longitudinal radial section of the wood of the Oak . . 71 



33 Longitudinal tangential section of the wood of the Oak . 72 



34 Cambium of the Scotch Fir in transverse section . . 73 



35 Section through a branch of the Cork-oak to show primary 



and secondary medullary rays 75 



36 Part of a pitted wood-vessel from the Oak .... 77 



37 Macerated oak-wood 79 



38 Formation of cork in the Beech 83 



39 Transverse section of oak-bark 84 



40 Eadial longitudinal section of oak-bark .... 85 



41 Horse-chestnut buds 94 



42 Markings on a branch of Horse-chestnut .... 95 



43 Diagram illustrating phyllotaxy 97 



44 Phyllotaxy of the Plantain 98 



45 Stipulate leaves 99 



46 Transverse section through the leaf of the Hellebore . . 101 



47 Stomata in surface view 103 



48 Longitudinal section through the leaf-stalk of the Poplar to 



illustrate leaf-fall 106 



49 Mycelium, germinating spores and sporangia of Mucor . 113 



50 Conjugation of Mucor 115 



51 Conjugation of Spirogyra 117 



52 Khizome of Pteris 121 



53 Transverse section of Pteris rhizome (low power) . . 123 



54 Transverse section of a bundle from the rhizome of Pteris . 125 



55 Longitudinal section of the rhizome of Pteris . . . 126 



56 Macerated rhizome of Pteris 127 



57 Transverse section through a sorus of Pteris . . . 130 



58 Development of the sporangium in the Fern . . . 131 



59 Germinating spores and young prothallus of the Fern . 133 



60 Archegonia of the Fern 134 



61 Antheridia and antherozoid of the Fern . 135 



