VOL. XXI.] VHILOSOPHICAL TRANSACTIONS. 44^ 



the vesiculae seminales, because the nearness of the sphincter muscle so corru- 

 gates the inner membrane of the urethra, as prevents an easy passage of the 

 liquor by the ostiola of the former : nor can the semen rim out of the latter, 

 since the caruncula or caput gallinaginis is contrived on purpose to prevent 

 it: wherefore the diaphragm, abdominal muscles, and levatores ani, are em- 

 ployed in compressing those parts, to discharge their contents. 



It is not improbable that the matter which flows at the latter end of the 

 cure of venereal diseases, and is called a gleet, proceeds from these glands, 

 and not from the prostatas or vesiculae seminales, as is commonly supposed; 

 which may afford us no mean argument for the use of injections in such cases ; 

 instead of which, some practitioners persecute their patients with violent purges, 

 and cram them with vast quantities of astringent medicines. We may easily 

 conceive how such gleets become sometimes very obstinate, if not incurable, 

 by supposing the ulcer in that contact to happen upon the ostiola of these 

 secretory ducts. 



In fig. 3, pi. 10, A, is a portion of the bladder of urine; bb, parts of the 

 ureters; cc, parts of the vasa deferentia; dd, the vesiculae seminales, some- 

 what distended with wind, by blowing into the vasa deferentia ; aa, the blood 

 vessels of the vesiculae seminales; e, the glandulas prostatas; f, the urethra 

 expanded, after opening its superior and fore part, to see the ostiola of the 

 excretory ducts of the following glands ; gg, the two glands above described, 

 which from the liquor they separate maybe called glandulae mucosae; h, the 

 excretory duct of one of the last mentioned glands, before it passes under the 

 bulb of the cavernous body of the urethra ; i, the bulb of the cavernous body 

 of the urethra, partly distended with wind, and divested of the accelerator 

 muscle to show its external membrane, which is very thin, whereby the last 

 named muscle more adequately compresses that bulb, and drives its contained 

 blood towards the glands, when the penis is erected; k, the third pair of 

 muscles of the penis; ll, the accelerator muscle, divided in its middle seam 

 on the bulb, and afterwards freed from it, and expanded ; 11, the upper part 

 of this muscle which passes immediately over the mucous glands; mm, the 

 musculi directores penis ; nn, the cavernous body of the penis; o, the caver- 

 nous body of the urethra ; p, the ligature made to prevent the wind from 

 passing out of the cavernous body of the urethra and its bulb ; q, the aperture 

 by which the inflation was made. 



Fig. 2, one of the mucous glands, after being macerated in water, and its 

 excretory duct filled with quicksilver ; a, the mucous gland somewhat distended » 

 B, its excretory duct; c, a portion of the internal membrane of the urethra 

 expanded; d, the ostiola of the last mentioned excretory duct. 



