398 THE SOLIDS. 



AGGREGATED GLANDS. 



The aggregated, agniinated or Peyers glands are present in 

 the lower portion of the iliutn only. 



They occur in patches of various sizes, each of which 

 is made up of a considerable number of distinct glandular, 

 having much the same structure, form and volume, as the 

 solitary glands, an aggregation of which they may be con- 

 sidered to be. These patches may be readily recognised 

 without the assistance of glasses. 



In the " glandulae aggregate," central apertures are occa- 

 sionally present, and they are not unfrequently surrounded 

 by the short tubular ca3ca3 already spoken of : the interspaces 

 between the glandular in the human subject are very generally 

 covered with villi. The size and limits of these glands may 

 be best determined by injection. 



When examined with glasses as they lie in the mucous 

 membrane in situ, they appear rounded and flat, presenting 

 many dark spots, the nature of which is not understood : when 

 viewed sideways, they are seen to be really of a flask-shape, 

 the narrow extremity of the flask being turned towards the 

 surface of the mucous membrane. (Plate LII. figs. 3, 4.) 



In inflammation of the mucous membrane of the ilium, a 

 frequent concomitant of low fevers, these glands are often 

 found to be entirely eaten away, but sometimes they are 

 only so far eroded as to present in place of closed glands, a 

 number of open cells or follicles. 



MULTILOCULAR GLANDS. 



SEBACEOUS GLANDS. 



The sabaceous glands are very generally distributed over 

 the surface of the body, probably not less so than the sudo- 

 riferous glands, there being but two situations in which they 



