igS 



ANCIENT PLANTS 



Taxese, fleshy seeds of, 89. 



Taxodium, 86. 



Taxits, 82. 



Time, divisions of geological time, 34. 



Tracheides for water storage, 56, 30. 



Tree-ferns, 130. 



Trigonocarpus, 11, 76, 82, 122, 84. 



- — • once supposed to be a Monocotyledon, 



82. 

 — probably the seed of Medullosa, 121. 

 Tubicaulis, 127, 8g. 



Unexplored world, 3. 



Unicellular plants, 47, ly. 



division of cells in, 47, 48, 18. 



^'Vascular bundles", relation of to steles, 



•— tissue, 57, 31, 32, 33, 59. 



continued growth of, 65, 43. 



importance in plant anatomy, 61 



et seq. 

 Vibtirnum, 84, 85. 



Watts, 187. 



Westphalia, 19. 



WiELAND, 2, 102, 187. 



Williamson, ^, 187. 



Williamsonia, 104. 



Wood, cells composing, 57, 31. 



— centrifugal development of, 97, 6^. 



— centripetal development of, 97,. 65. 



— parenchyma, 57, 31. 



— silicified, 17, 80, 87. 



— solid rings of formed by cambium, 66, 



44. 



— vessels of Angiosperms, 58. 



Yellowstone Park, 17, 167. 

 Yew, 82. 

 Yucca, 82. 



Zeiller,, 2, 187. 



ZiTTEL, 187. 

 Zygopteris, 127. 



