LIST OF ILLUSTRATIONS. 



no. PAGE 



1 Yeast under a high power 3 



2 Cell of Spirogyra 7 



3 Various cells under a high power 12 



4 Seed and seedling of the Bean 17 



5 Germination of the Gourd 21 



6 Rhizome of a Sedge 23 



7 Aerial tubers of the Potato 24 



8 Seedling Potato bearing tubers 25 



9 Ivy, showing adventitious roots 27 



10 Starch grains highly magnified 28 



11 Bulb of the Tulip 31 



12 Germinating Bean, the root curving downwards gcotropically . 33 



13 Transverse section of the root of the Bean .... 35 



14 Eoot-cap diagrammatically represented ..... 38 



15 Diagram of merismatic tissue 39 



16 Diagram illustrating the structure of the root- tip ... 41 



17 Transverse section of the bean-root (high power) ... 42 



18 Transverse section showing the origin of the secondary roots 



of the Bean 46 



19 Mustard seedling, showing root-hairs 47 



20 Seedling Wheat with soil adhering to the roots ... 48 



21 Stem of Pimpernel, showing nodes and internodes . . 51 



22 Diagram of the transverse section of the stem of Helianthus . 54 



23 Transverse section of stem of Helianthus tuberosus under a 



high power 57 



24 Longitudinal section through the stem of Helianthus tuberosus 59 



25 Model of a pitted cell-wall , 60 



