XVII.] INTESTINE. BILE. PANCREATIC JUICE. 179 



clear free borders of the cells frequently 

 appear to have coalesced into a narrow 

 highly refractive band, which may be 

 traced over the whole villus. 



/3. The mucous or goblet cells, irregularly 

 scattered among the former, sometimes 

 abundant, sometimes scanty or absent ; 

 they have an upper ovoid portion which 

 has sharp outlines, is transparent and 

 may be empty, and a lower basal granu- 

 lar portion containing the nucleus. 



7. The adenoid tissue, forming the sub- 

 stance of the villus : this consists of a 

 fine meshwork of fibres with nuclei or 

 flattened cells at some of the nodal 

 points. The meshes are seen to be 

 crowded with leucocytes. 



There may also be seen with varying dis- 

 tinctness 



S. Capillary blood-vessels with the nuclei 

 of their component cells ; they may be 

 filled with blood-corpuscles. 



e. The ' lacteal radicle ' as a space in the 

 centre of the villus. 



^. Unstriped muscular fibres as narrow 

 bands running up the villus. 



b. The rather deep depressions of the mucous 

 membrane, the intestinal glands or glands 

 of Lieberkiihn. Note that 



12—2 



