412 



LECTURE XVII. 



long, in particular, a part of the laminated bodies, that 

 are found in the prostate of every adult man and under 

 certain circumstances accumulate in large quantities, so 

 as to form the so-called prostatic concretions ; and also 

 rare forms of a similar kind which have been shown by 

 Frederich to occur in several conditions of the lungs. 



These formations vary in size from very small, simple, 

 homogeneous looking, structures up to gigantic bodies, in 

 which, when they are regularly formed, we see a suc- 

 cession of very numerous layers. Just as the small 

 amyloid corpuscles of the nervous system are frequently 

 composed of two separate ones and constitute twin 

 structures, it very frequently happens here also, that a 

 common envelope encloses separate centres (Fig. 120, 

 d, e). Nay, in isolated cases this goes on to such an 

 extent, that whole heaps of smaller bodies are held 

 together by larger common layers. These very large 



FIG. 120. 



Fig. 120. Laminated prostatic amyloid bodies (concretions) ; a, oblong, pale 

 homogeneous corpuscle, with a nucleus-like body. b. A larger, laminated corpuscle 

 with pale centre, c. A. still larger corpuscle with several layers and a coloured 

 centre, d, e. Bodies with two and three centres, in c? of a deeper colour. /. Large 

 concretion with a dark-brown, large centre. Magnified 300 diameters. 



