i88 
Sir Everard Home's observations 
there by plugging up the trunks with common injection. 
The parts were then dried, and put into oil of turpentine. 
When preserved some time in that state, a longitudinal sec- 
tion of one of the corpora cavernosa was made, as in Plate 
XX, and the quicksilver allowed to run out. The prepa- 
ration thus made is in the Collection of the Royal College 
of Surgeons in London ; one of the many valuable donations 
made to that Museum by Sir William Blizard. The others 
were made upon this occasion. 
From these preparations, the fact is sufficiently established, 
that the cellular internal structure of the corpora cavernosa 
and corpus spongiosum, receives the blood into its cavities 
directly from the smaller branches of the arteries with which 
these parts are provided ; but the nature of this structure 
remains to be explained. 
It was found by Mr. Bauer, from an examination of these 
different preparations, that the cellular structure of the cor- 
pora cavernosa is made up of an infinite number of thin 
membranous plates, exceedingly elastic, so connected to- 
gether as to form a kind of trellis work, the edge of which 
is firmly connected with the strong elastic ligamentous sub- 
stance by which these bodies are surrounded, and which forms 
a septum between them, separating them from one another. 
This substance has an intermixture of muscular fibres. The 
septum has not the same appearance in different individuals ; 
in some, it is much thicker than in others ; and towards the 
anterior end, in one preparation, was almost entirely wanting ; 
as in Plate XVIII, Fig. 2. 
In the central line of each corpus cavernosum there is an 
open space. This is of considerable length, but is by no 
