201 
of the human prostate Gland . 
next the bladder, but rendered a separate lobe by two fissures 
on its opposite surface. Its ducts passed directly through the 
coats of the bladder, on which it lay, anti opened immediately 
behind the verumontanum. By means of this lobe a circular 
aperture is formed in the prostate gland, which gives passage 
to the vasa deferentia. 
The appearance of this lobe has been since examined in a 
subject 24 years of age, and it was found still larger and 
more distinct. A representation of it is given in the annexed 
Plate. 
Previous to this investigation it was not known to me that 
any distinct portion of the prostate gland was situated between 
the vasa deferentia and the bladder. These ducts were con- 
sidered to pass in the sulcus between its two posterior portions, 
in close contact with the body of the gland. This account 
corresponds also with the description given by Winslow and 
Haller ; it is however now proved to be erroneous. It is not 
in my power to determine whether all the anatomists of the 
present day have fallen into this error in the same degree 
with myself: but none of them have pointed out this lobe ; 
and, therefore, in whatever way they have described the vasa 
deferentia to pass into the bladder, they have neither antici- 
pated nor thrown any light on the present inquiry.* Haller 
says expressly, that “ the prostate gland has no lobular ap- 
pearance,” and the anxiety which all anatomists have to im- 
prove their art, would have led them to correct this error, had 
they discerned that it was one. 
This newly acquired anatomical fact enables us very clearly 
* Glandula, aut eerte cellulosum compactum corpus, quod prostata dicitur. P. 464, 
Fabrica obscura est, et neque glandule simplicis similis, cujus cavea esset aliqua„ 
neque composite 3 neque enim in lobulos recte discedit. P. 465. Elem, Physiologies 
Corporis Humani, Autore Albert. Haller. Tom. VII. 
D d 
MDCCCVI. 
