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Ductus Deferens : This tube seems to be peculiarly free from 

 severe inflammatory processes, and when these appear they are 

 limited to the mucosa. The cells of the lining membrane not in- 

 frequently show a mild type of degeneration and exfoliation, or in 

 the more chronic forms, the entire membrane degenerates and disap- 

 pears. In man, the duct occasionally becomes occluded, but so far 

 I have failed to find this condition in the bull. Undoubtedly, when 

 the occlusion does occur, it is near the origin of the duct at the 

 tail of the epididymis. 



Seminal Vesicles: The seminal vesicles and epididymis, 

 especially the tail, seem to be the parts most subject to extensive 

 pathological changes, and bacterial invasion. In most instances, 

 diseased vesicles present gross manifestations recognizable on 

 clinical examination, while on the other hand microscopic changes 

 may be present in the absence of gross lesions. As diagnosed on 

 physical examination, or even on post mortem examination of the 

 tract, the various forms may be classified into : 



1. Acute Catarrlial Type: In this form, the vesicles are usually 

 enlarged, soft, and more or less reddened by hyperaemia. On 

 physical examination of the animal, distinct flinching is produced 

 when pressure is applied to the organ. Enlargement may even 

 be absent in the early stages, and the diagnosis may be made from 

 the extrenie sensitiveness alone. 



2. Suppurative or Cystic Types: In both of these types, the 

 vesicles are usually enlarged, either uniformly, or, as is usually the 

 case, in localized areas. The suppurative form may extend over 

 the entire gland, forming one large encapsulated abscess, or on the 

 other hand, it may take the form of variable sized abscesses with 

 thick sclerotic, or thin fluctuating walls. Occasionally the abscesses 

 rupture and discharge their contents into the rectum. Dr. Wil- 

 liams presented one case of this type. One vesicle was apparently 

 normal, whereas the other was about five times larger than normal, 

 and consisted of a dense outer capsule which was adherent to all 

 surrounding parts. On dissection, it was found that the organ 

 consisted of abscesses of various sizes, the larger one of which had 

 ruptured some time previously into the rectum, leaving the dis- 

 tinct remains of an opening into that part. The cystic form may 

 occur either with or without suppuration. One case came to my 

 attention in which both vesicles were made up of abscesses of 

 varying sizes as well as of a smaller number of cysts. Evidently 

 the cysts were of the retention type, and were secondary to the 

 pyogenic infection, 



3. Chronic or Sclerotic Type: This form is characterized by a 

 distinct firmness with or without marked enlargement. The con- 

 dition may be accompanied by disease of the parenchymatous tissue 

 or it may take the form of a chronic productive inflammation of 

 the interstitial tissue. This inflammation may be simply a super- 

 ficial thickening, or it may extend in between the lobules. 



