xiv CONTENTS. 



B. Cell Contents 75 



1. STARCH GRAINS 7."> 



a. Potato Tuber, Solatium tuheroaum 75 



b. Garden Pea, I'ixnni satirum 76 



c. Wheat Grain, Triticum vulgare 76 



Structure of (Vrral (i rains 77 



d. Grain of Indian Corn, Zea Mays 78 



e. Grain of Oat, Avena saliva 78 



2. CRYSTALS 78 



Crystal Prisms, Onion Bulb, Allium Cepa 79 



Haphides, Roots of Many Plants 80 



3. PROTEIN GRANULES 80 



a. Crystalloids, Potato Tuber 75 



b. Aleurone Grains, Garden Pea, Corn and Wheat Grains 76 



CYSTOLITHS 80 



Leaf of Ficus elastica 80 



INULIN 80 



Root of Dahlia 80 



C. Elementary Tissues 82 



1. PARENCHYMA TISSUE 82 



a. Isodiametric, Stem of Geranium -' 



b. Ellipsoidal, Root of Hyarinth 83 



c. Irregular and Epidermal, Leaf of Geranium .~. 83 



d. Stellate, Petiole of Pontcderia * 



e. Suberous, Bark of Cork Oak 84 



MODIFICATION OP CELL WALL '. 8. r > 



a. Cell Walls with Mucilage, Seed Coat of Flax .' 



b. Cell Walls with Lignin, Fibrous Tissue 85 



c. Cell Walls with Cutin, Epidermis of Cycas leaf 86 



d. Cell Walls with Minerals, Stem of Equteetum 86 



CONTINUITY OF PROTOPLASM 86 



2. COLLENCHYMA TISSUE 87 



Stem of Begonia or Geranium 87 



ENDODERMAL CELLS, 87 



3. SCLERENCHYMA TISSUE 88 



a. Roots of Dahlia variabilis 88 



b. Ivory Nut, PliytelepJias macrocarpa 88 



c. Rhizome of Pteris aquUina 89 



4 and 5. PROSENCHYMA TISSUE 89 



Prosenchyma Proper 89 



Wood and Bast Cells, Leatherwood, Dirca palustrte 90 



Tracheary Tissue 90 



Tracheids, Stems of Horse Chestnut, Moon Seed and Grape Vines 91 



Tracheids of Coniferae, Pinus Strobus 92 



Tracheae if.' 



a. Dotted, Stem of Grape Vine 93 



b. Pitted; c. Spiral; d. Reticulated; e. Scalariform 94 



Stem of Castor Oil Bean 94 



f. Annular, Stem of Corn _ 94 



g. Trabecular, Leaf of Juniper 94 



6. SIEVE TISSUE 94 



Stem of Cucumber, or Pumpkin 95 



7. LATICIFEROUS TISSUE 95 



Latex Cells, Stem or Petiole of Euphorbia 96 



Latex Tubes 01 Yt-s.-l-, Stem or Petiole of Celandine 96 



