EXPLANATION OF THE PLATES. 341 



PLATE X. 

 VEGETABLE TEXTURES. 



Fig. 1. — The cellular texture highly magnified, exhibiting the 

 communicating pores and slits. 



Fig. 2. — A bundle of Entire vessels, or without perforations. 



Fig. 3. — A Perforated vessel, called also Cribriform. 



Fig. 4. — The same magnified so as to exhibit the elevated borders 

 of the perforations. 



Fig. 5. — Moniliform or Bead-like perforated vessels. 



Fig. 6. — Annular vessels, the perforations or slits almost dividing 

 the vessel into rings ; their borders also elevated. 



Fig. 7. — A Spiral vessel. Called also Trachea. 



Fig. 8. — A Spiral vessel magnified, showing also the elevated, 

 and probably glandular border ; the thread of which is some- 

 times double. 



Fig. 9. — A magnified portion of the stem of a Palm (Ptychosper- 

 ma gracilis), a. The exterior ligneous and vascular bundles, 

 which are more indurated than the interior ones. b. Interior 

 ligneous and vascular bundles. 



Fig. 10. — Origin of Buds. — A transverse section of a branch 

 of Philadelphus coronarius or Mock Orange, eight years old. 

 a. b. c. Buds just developed, the origin of which may be 

 traced to the first year's growth of the branch. 



Fig. 11. — A portion of the two innermost ligneous circles of 

 10. highly magnified, a. b. c. The tracks of the buds con- 

 joined, and connected with the medulla of the branch. 



Fig. 12. — A wedge cut from the trunk of a Lilac tree 20 years 

 old. a. A bud not yet completely developed, b. One fully 

 formed : both originated in the first year's growth of the stem . 



PLATE XL 



THE TEXTURE OF VEGETABLES. 



Fig. 1. The Liber, or Inner Bark. a. a. a. The reticular ar- 

 rangement of the longitudinal fibres ; and b. b. b. The cellu- 

 lar meshes. 



Fig. 2. — A transverse section of the peduncle of the Water Lily 

 (JVymphaa odorata) , in which there are 2 series of pneumat- 

 ic cells ; a. 4 large and central ; and b. 8 other smaller, by pairs 

 arranged contiguous to the larger. Within the large cells, 

 more particularly towards the root, are scattered hairs which 



