XIV LIST OF ILLUSTRATIONS 



FIGURE TITLE PAGE 



35 Winter buds 72 



36 Onion leaf 72 



37 Pitcher Plant (Sarracenia purpurea) 73 



38 Sundew 73 



39 Sensitive Fern (Onoclea sensibilis) 74 



40 Floral parts of Azalea (Loiseleuria) 75 



41 Ideal vertical section of a Flowering Plant 76 



42 Generalized plant cell 77 



43 Root tip 79 



44 Root hair 80 



45 Cross section of a stem 81 



46 A bud of Elodea canadensis 82 



47 Cross section of a leaf 83 



48 Diagram illustrating the physiology of a plant .... 87 



49 Ulothrix 95 



50 Oedogoniurn, filamentous form 97 



51 Oedogonium, zygote 98 



52 A Brown Alga (Ectocarpm) 99 



53 Life history of a Moss 101 



54 Life history of a Fern 104 



55 Decline of gametophyte and increase of sporophyte . . . 105 



56 Life history of a higher Fern 106 



57 Megaspore and microspore 107 



58 Typical flower 107 



59 Transition between petals and stamens 108 



60 Union of carpels to form the ovule case 108 



61 The life history of a higher Flowering Plant 110 



62 Seed of Violet Ill 



63 Diagram of comparative morphology of plants .... 112 



64 Hydra, longitudinal section 119 



65 Hydra, transverse section 120 



66 Earthworm, body plan 122 



67 Dissection of Earthworm (Lumbricus terrestris) .... 123 



68 Earthworm, transverse section .......... 124 



69 Stages in development of the Earthworm 126 



70 Structure of a primitive Arthropod . , 130 



71 Dissection of Crayfish (Cambarus affinis) 131 



72 Appendages of Crayfish 132 



73 Nervous system of Earthworm and Crayfish .... 134 



74 Sagittal section of an ideal Vertebrate 137 



75 Cross section of an ideal Vertebrate 137 



76 Section of human skin 139 



77 Skeleton of a bony Fish (Perca fluviatitis} . 141 



