SECT. IV. APPENDAGES. 371 



of the cellular tissue which still remains entire, as 

 may be seen in the transparent structure of the 

 leaves of Typha and many other plants. Trans- 

 verse gaps are said to be observable also in the bark 

 of some plants, though very rarely.* 



SECTION IV. 



Appendages. 



As the decomposite and composite organs are Division* 

 found to be furnished with several appendages, so 

 also are the elementary organs ; for such, at least, 

 I shall at present denominate the internal glands 

 and pubescence. 



SUBSECTION I. 



Internal Glands In the description of the ex- As c!e- 

 ternal structure of the plant, we found that certain Mi r bel. * 

 substances which appear on the surface of the 

 leaves, foot-stalks, and branches, have been regarded 

 as glands, and distributed into different species ac- 

 cording to their form or situation. Whether they 

 really perform the functions of glands or not, is a 

 question which is, perhaps, not yet satisfactorily 

 solved. But there are other substances situated in 

 the interior of the plant, and attached to, or incor- 

 porated with, the elementary organs, which have 



* Mirbel Phys. Veget. vol. i. p. 75* 



