LIST OF ILLUSTRATIONS. 



HO PA01! 



36. Nut Ivory, Original, 25 



37. Gritty tissue of Pear, how formed, do. 25 



38. Gritty tissue of Pear, highly magnified, do. 25 



89. Testa of Nut Ivory, sclerogen of, do. 25 



40. Section of Cherry stone, sclerogen of, do. 26 



41. Section of shell of Cocoanut, showing sclerogen, ... do. 26 



42. Flax Plant, Authors, 27 



43. Hemp Plant, do. 27 



44. New Zealand Flax, , do. 27 



45. Yucca gloriosa, do. 27 



46. Fibres of Flax displaying elementary structure, . . . Original, 28 



47. Spiral vessels in their full integrity, do. 29 



48. Spiral vessels becoming annular, do. 30 



49. Annular vessels fully developed, do. 30 



50. Annular rings, do. 31 



61. Scalariform vessels, Authors, 31 



52. Old vessel, Original, 31 



58. Scalariform vessels from a transverse section of a Fern, . . do. 31 



54. Dotted duct of Fir, T' < .' do. 32 



55. Dotted duct of Pine, .,. ; ;.'i . do. 32 



56. Dotted duct of Pinus Strobus, - " ! Authors, 32 



57. Dotted duct of Araucaria, ^ . : *< do. 32 



58. Duct from fossil wood, k ; . Original, 33 



59. Porous tissue, Authors, 33 



60. Dotted vessel, . 1 Vl- J * : *" do. 33 



61. Porous duct, Locust tree, Original, 34 



62. Porous vessel, Apple, do. 34 



68. Porous duct, Bass-wood, do. 34 



64. Arachnoidiscus Ehrenbergii, from Peruvian guano, ... do. 36 



65. Silica of Rye, do. 37 



66. Campilodiscus clupeus, from the Bergmehl, . . . * ; **'* do. 39 



67. Silica of the Oat, . & do. 39 



68. Silica of the Wheat, ;-: ^ ^l ? - do. 39 



69. Silica of the Rice, uv - -i-' . do. 39 



70. Silica of Equisetum hyemale, > i~ do. 39 



71. Upper cuticle, Deutzia scabra (stellate crystals), v < ''** do. 40 



72. Under cuticle, " " " " '. -v ^r do. 41 

 78. Hair of Cowitch, showing spines, "-,-'-, do. 42 



74. Venus' Fly-trap showing the like, . . . . . . Authors, 42 



75. Fibres of Cotton, showing ultimate structure of, . . . . Original, 43 



76. Hairs of plants, ^b =#.-./ Authors, 48 



77. Hair of Nettle, with poison gland, . . . . ife;*^. do. 43 



78. Hair of Chinese Sundew, do. 43 



79. Cuticle of Ruscus aculeatus, Original, 45 



80. Cuticle of Ivy, . . -o '' do. 45 



81. Cuticle of White Lily ,. T , do. 45 



82. Section of Melon leaf, showing its structure do. 46 



88. Section of Balsam, do. 47 



84. Cherry leaf, to show venation, Authors, 48 



85. Tree Fern, .... i ...... do. 50 



86. Section of Fern, showing its structure, , , ... do. 50 



87. Monocotoledonous stem, do. 51 



88. Exogenous stem, *.-...... do. 53 



