﻿IX, B, 3 Boynton: Kidney -worm Infestation of Swine 281 



early calcification because of its homogeneous appearance and 

 which contains a , large amount of cell detritus. Immediately 

 around this zone is the capsule, /, made up of rather old and 

 well-formed connective tissue. Hence it appears that this worm 

 tract has been present for some time. A still older tract is 

 shown in Plate III, fig. 1, g, in which the central part has become 

 a granular mass of broken down and degenerated cells. The 

 zone which bounds this central mass, h, stains a rather deep 

 red with eosin; it is homogeneous, and has all the appearances 

 of a calcified mass. The zone, i, surrounding this is made up of 

 old fibrous connective tissue which forms the wall of the tract. 



SUPPLEMENTARY OBSERVATIONS 



Since the completion of the preceding general description 

 of lesions, two animals, Berkshire sows A-17 and A-25, have died 

 of kidney-worm infestation. 



Animal A-17 was 4 years 8 months and 6 days old when she 

 died. She aborted about three weeks prior to death, and had 

 seemed unthrifty for some time. Death occurred in the evening 

 of October 27, but the autopsy was not made until the following 

 morning. 



Post-mortem changes were well advanced. The viscera had 

 a pungent repulsive odor. The peritoneal cavity contained a 

 large amount of blood-stained fluid. The liver was markedly 

 distended, soft, of a purplish color, and contained collections 

 of gas bubbles under the capsule. The lobes were slightly 

 adherent to each other at their dependent portions by a grayish 

 feltlike exudate. 



The small intestines and especially the colon were oedematous 

 and slightly adherent by a fibrinous exudate. The mesenteric 

 lymph glands were enlarged and in some instances slightly 

 indurated. 



The right kidney measured 16 centimeters in length, 9 centi- 

 meters in width at its anterior end, and 6.5 centimeters in 

 width at its posterior end. It was 5.5 centimeters in thick- 

 ness at the anterior end and 4 centimeters at the posterior end. 

 A retention cyst 5.5 by 4 centimeters, which projected 1.5 centi- 

 meters above the surface, was present at the anterior end. 

 This retention cyst was denuded of parenchymatous tissue on its 

 upper surface, being covered only by a fibrous connective tissue 

 capsule. At the tip of the posterior end, the capsule was adher- 

 ent to a scar tissue on the kidney. This scar measures 3 by 

 1.5 centimeters. 



On sectioning this kidney, an oval encapsulated abscess, 1.3 by 



