INDEX 



379 



Sporophyte, 218 

 Staining sections, 264, 268 

 Starch, 176 



grains, forms of, 185 



sheath, 34 

 Steapsins, 192 

 Stele, 2 5 



Stinging hairs, 67 

 Stomata, action of , 127 



function of, 126 



relation of, to environment, 129 



structure and frequency of, 125 



use of, in transpiration, 128 

 Stone cells, 32, 75, 81 



develoj)ment of, diagram, 33 

 different forms of, 82, Fig. 38 

 Storage, 175 



of water, 195 



process of, 182 



tissues, characteristics of, 187 

 location and extent of, 187 

 Stored food, fluctuations in phys- 

 ical character of, 190 

 Suberin, 68 

 Suberization, 69 

 Synergids, 229 



Tannin cells, 205 

 Tillandsia usneoides, 97, Fig. 47 

 Tissues, differentiation of, 24, 25 

 primary, diagram of, 3 1 

 topography of, 31 

 Tracheal tube, development of, 38 

 tissues as food carriers, 160 

 duration of activity of, 1 1 1 

 relation of, to medullary rays 

 and Avood parenchyma, 

 no 

 tubes, 102 



course of, through stem, 103 

 in mono- and dicotyledons, 

 Figs. 49, so 

 Tracheid, development of, 39 

 Tracheids, 106 



bordered pits in, development 

 of. Fig. 51 

 Transporting systein, loi 



tissues, 157 

 Triple-fusion nucleus, 230 

 Turpentine, 199 



Tubercle bacilli, 

 Tyrosin, 182 



154 



Ulothrix, iQ 



Unit characters, 241 



dominance of, 242 

 recombinations of, 242 

 segregation of, 242 



Urtica, sting hairs of, 67 



Vascular bundle, 24 



primary, 36, 



types of, 43 

 bundles, anastomosis of, 42 



growth of, 46 



in leaves, 44 



constitution of , 164 



in roots, 53 

 Vegetative nucleus, 229 

 Veins, frequency of, 164 

 Velamen 96, Figs. 45, 46 



Water absorption, different meth- 

 ods of, 98 

 ascent of, 116 

 distribution of, through leaf, 



114 

 method of intake of, 94 

 path of ascent of, 118 

 storage of, 195 

 Water-conducting tissues, influ- 

 ence of environment on, 

 118 

 Water-storage tissues, 148, 149 



characteristics of, 196 

 Wood fibers, 79 



development of, 39 

 length of, 79 



Xanthin, 10 

 Xylem, 24 



constitution of, 38 



figure showing stages in devel- 

 opment of, 40 



parenchyma, development of, 



3Q 

 secondary, 41 



Yeast, culture of, 23 



