INFLAMMA TION. 



429 



any such changes. For particulars I refer to the two following 

 articles. Epithelia and endothelia are likewise subject to this 

 degeneration f. i., in the liver, the kidneys. The epithelia of the 

 lungs sometimes give rise to homogeneous or concentrically stri- 

 ated colloid corpuscles, and such are sometimes observed in the 

 epithelia of the prostate gland. The concentric colloid corpus- 

 cles of the latter organ may become the seat of calcareous depo- 

 sitions, and are sometimes voided with the urine. They are not 

 of uncommon occurrence. (See chapter on urine.) 



Peculiar, but certainly kindred, formations are the colloid 

 corpuscles of the nervous system. Usually they exhibit a concentric 

 striation; sometimes two or more such concentrically striated 

 corpuscles may be surrounded by a common homogeneous or 

 striated layer. (See Fig. 179.) Virchow, by mistake, termed 



FIG. 179. COLLOID OR AMYLACEOUS CORPUSCLES OF THE ARACHNOID 

 OF THE SPINAL CORD OF AN ADULT. 



A, concentrically striated amyloid corpiiscle ; O, group of medullary corpuscles in colloid 

 degeneration ; L, medullary corpuscles in the beginning of colloid degeneration. Magnified 

 600 diameters. 



them " amylaceous" corpuscles. In the arachnoid of a man 

 whose brain, crowded with these corpuscles, was in the condition 

 of the so-called " gray atrophy/' I could trace the origin of these 

 formations from medullary elements, which had arisen in the 

 fibrous tissue of the arachnoid in consequence, evidently, of a 



