DESCRIPTION OF THE PLATES. 



PLATE J. 



Cellular Tissue. 

 Fig. 



1. Round Cellular Tissue. 



2. Hexahedral ditto ditto. 



3 Ditto ditto ditto, showing the Intercellular Passages. 



4. A Section of a portion highly magnified, from Kieser. 



5, 6. Cellules separated from the others. 



7. Elongated cellules of the wood and bark. 



8. Elongated cellules which surround the vessels. 



9. 10. Muriform cellular tissue from the Medullary Rays. 



PLATE II. 



The I 'esse Is. 

 Fig. 



1. A longitudinal section of a fibre of the leaf of Tritoma Uvaria, showing in a. a. 



the Trachea?, and b. b. the striped vessels. 



2. u.a. the striped, and b.b. the dotted, vessels, from the stem of Lycopodium denti- 



culatum. 



3. A Trachea of Musa Paradisiaca, showing the band to be composed of several 



spiral fibres. 



4. A Trachea, from Dutrochet. 



5. a. a. striped, and b. b. dotted, vessels, from the stem of Smilax aspera. 



6. A strangulated vessel. 



7. a. a reticulated ditto ; b. an example, from Mirbel, showing a trachea changing 



into a striped or annular vessel. 



PLATE III. 



Cuticle and Stomuta. 

 Fig. 



1. Cutic'e and Stomata of Patonia. 



2. Ditto ditto of Iris Germanica. 



3. Ditto ditto from the lower surface of the leaf of Lycopodium denti- 



culalum. 



4. Portion of a longitudinal and vertical section of a leaf of Tritoma Uvaria, 



showing the cellules of the cuticle and those of the parenchyma. 



5. A longitudinal section of the same leaf, made parallel to the surfaces, showing the 



longitudinal fibres of the nerves, the parenchyma, and bundles of Raphides. 



6. The Raphides more highly magnified. 



7. Portion of a transverse section of a leaf of Yucca aloifolia, showing the dif- 



ference between the compact cellules of the cuticle and those of the parenchyma. 



8. A vertical section of Fig. 2. 



