on the human urethra. 
To describe the appearance which is so beautifully repre- 
sented in the drawing, would be trifling with the time of the 
Society ; and I am afraid that I have already allowed myself 
to say much more upon several of the other subjects con- 
tained in this paper than was necessary, illustrated as they 
are by Mr. Bauer’s drawings. 
EXPLANATION OF THE PLATES. 
Plate XVIII. 
Consists of two figures or transverse sections of the same 
penis, magnified four times in diameter. 
Fig. 1. Shows the internal structure of the corpora caver- 
nosa near the middle of the penis, where the central part is 
one general cavity, surrounded every where by the open 
trellis work ; the interstices are filled with coagula of the 
blood they contained at the time of the person’s death ; the 
divided trunks of the arteries which supplied the blood are 
very distinct. 
Upon the dorsum penis are seen the divided arteries which 
lie there, imbedded in the elastic ligamentous and muscular 
substance, by which the corpora cavernosa are covered, and 
which is continued between them, forming the septum ; it 
also completely surrounds them. 
The cellular structure of the corpus spongiosum forms a 
similar trellis work upon a smaller scale ; the urethra passes 
through it rather above the centre. The lining is thrown 
into folds, and the opening, which is closed, is flattened, 
being more compressed from above and below than laterally. 
Fig. s. The same parts shown in a section nearer the 
glans. The trellis work here is more distended with blood. 
