372 ELEMENTARY ORGANS. CHAP. III. 



been also regarded under the character of glands, 

 particularly by M. Mirbel in his Vegetable Ana- 

 tomy, and which, if we adopt his opinion, we must 

 consequently denominate internal glands. Such 

 are the small and oblong or circular bodies which 

 Saussure describes as adhering to what he calls the 

 Thought cortical net-work of the epidermis. And: although 

 to be 6 Wlg * ne y have been regarded and described by Hedwig 

 Inerely as being merely pores, in which light they seem to 

 have been regarded by Grew also ; yet no one will 

 venture to affirm that there may not be something 

 glandular in their structure, that is, in the lip or 

 margin by which they are bounded according to the 

 opinion of Mirbel, who regards the circular lips or 

 rings, bounding the pores that perforate the cells or 

 tubes, as being glandular bodies contributing to the 

 elaboration of the juices of the plant, in their pas- 

 sage from one cell or vessel to another. 



SUBSECTION II. 



Internal Pubescence. Plants are furnished not 

 only with appendages which are fitly included un- 

 der the appellation of external pubescence ; but the 

 elementary and vascular organs of some of them 

 are furnished also with analogous appendages which 

 I shall accordingly denominate their internal pu- 

 First no- bescence. The internal pubescence seems to have 



ticccl 1)V 



Leuwen- been first noticed by Leuwenhoeck in his micro- 



" sco pical observations on the minute vessels of vege- 



fort, 



