198 



MANUAL OF PHYSIOLOGY. 



to that seen in packets within a lymph gland or in other lymph- 

 follicles. These are either isolated (solitary glands) or collected 

 into groups (agminated or Peyer's glands). Though called glands 

 by anatomists, it should be borne in mind that they are in no way 



FIG. 92. 



Section of Single Lymph-follicle of the Small Intestine, showing (a) fol- 

 licle covered with epithelium (6), which has fallen from the villi (c) ; (d) 

 Lieberkuhn's follicles; (e) Muscularis mucosse. (Cadiat.) 



connected with the secretion of any of the intestinal juices, but 

 belong to the absorbing arrangements of the intestine. Around 

 these solitary and grouped lymph-follicles are spaces and net- 

 works from which the lacteal vessels arise (Fig. 93). 



MECHANISM OF ABSORPTION. 



Formerly absorption was supposed to take place by means of 

 the bloodvessels alone, but after the discovery of lymph and chyle 

 vessels by Caspar Asellius the belief in the direct absorption by 

 the bloodvessels was completely abandoned, and all the work of 



