C. M. Jackson 
-~2 
~2 
sist at this time of compact embryonal fibrous tissue, in which the 
cavernous spaces are beginning to develop, especially toward the prox- 
imal end. The adipose tissue evidently appears shortly after birth, 
however, for it was found well developed in several instances in kittens 
only a few weeks old. There is no evidence to indicate that the adi- 
pose tissue is formed 
by a degeneration of 
cavernous or other 
tissue. Both caver- 
nous and adipose tis- 
sue evidently develop 
directly from em- 
bryonal — connective 
tissue, the adipose 
appearing at a slight- 
ly later date than 
the cavernous tissue. 
I have not had an 
opportunity to make 
extensive investiga- 
tion of the condi- 
tions in other ani- 
mals, but have ex- 
amined several speci- 
mens of the penis of 
the dog, sheep, pig. 
bull, and man. With 
the exception of the 
last, adipose tissue 
was found in greater 
or less amount in 
the corpora Caver- Fia.5. Cross-section of a cat's penis, near junction of middle 
nosa of all the fore- (ee tea een perficial plowass dv; dorsal vessels of the Denis; 
Song arias, Tin al eee ea ee ae ae ie ty of corpudeaveulvsum: 
cases, however, as in sania eee of corpus cavernosum ; ur, urethra, in corpus 
the cat, no adipose 
tissue was found in the corpus spongiosum. 
In the dog, the conditions are similar to those in the cat. The cor- 
pus spongiosum, including the bulb and glans, contains no adipose 
tissue. In the corpora cavernosa considerable fat is present, especially 
in the superficial portions, and toward the distal end. In the dog the 
