78 /ooLOGY. 



as regards their intimate structure, under two head>.oi 

 as being composed cither of small sacs, with oritico more or 

 less contracted, Off of tubes of extreme minuteness ; and the 

 diH'erences they present have a reference mainly to the mode 

 in which these, as it were . 'lenient ary >truct ure.>, are grouped. 

 155. The small secreting sacs are railed follicles, \\ lien 

 shallow they are called rn/pts, and many such may be seen 

 on the surface of mucous membranes. When each ha> a 

 separate or distinct orifice opening on the surface, they un- 

 called simple follicles, and many such exist on the Mirface of 

 the mucous membranes; if grouped close together, hut \//7/ 

 maintaining distinct orifices, they are called f//////vy////r// ,- 

 such are the glands of Meibomius on the eyelids, certain 

 gastric glands in some animals, &c. ; when grouped, but 

 having their orifices leading into a small cavity common to 

 all, and thus ultimately communicating with the surface by 

 one or more apertures only, as in the amygdalae or tonsils, 

 they are called agglomerated follicles. At other times little 

 sacs, which form the essential structure of the glandular 

 bodies we now speak of, communicate with the exterior by an 

 elongated neck, so as to resemble a tube, terminated by an 



.">]. Intimate Structure of a 

 (iland (theParoti.l). 



ampulla, and there they may either remain isolated or agglo- 

 merated in hunches, by means of common excretory tubes. 

 which, in their turn, reunite successively, to terminate by a 

 single duct (Fig. ol). The strivting organs, \\hich may be 



