XII, B, 3 Mardove: Balantidial Colitis 153 



dated area covering from 5 to 8 centimeters of lung tissue, 

 which upon section shows a smooth grayish to brown surface 

 with reddish brown, compact, raised, airless areas from which 

 a very small amount of fluid exudes on pressure and which 

 measure from 1 to 2 centimeters in diameter. The lower lobe 

 of the right lung shows areas similar to those of the lower lobe 

 of the left lung and also one large consolidated area of 4 to 5 

 centimeters in diameter. Many of these areas are abruptly 

 outlined with apparently normal lung tissue. On section of the 

 upper lobes they present a surface which is pale, smooth, air- 

 containing, and apparently normal. The bronchi contain a thin 

 mucoid material, and the mucosa shows no appreciable changes. 



The heart. The parietal pericardium is pale gray, smooth, 

 and thin. The pericardial sac is apparently normal. The epi- 

 cardium is pale and smooth, though some of the coronary ves- 

 sels have a tortuous appearance. The heart itself weighs 147 

 grams and is normal in shape. The auricles are filled with 

 blood. The tricuspid ring almost admits four fingers, and the 

 right ventricular cavity is enlarged and its walls are very thin. 

 The mitral ring admits two fingers, and the ventricular cavity 

 appears to be enlarged and the walls slightly thinner than nor- 

 mal. The muscle is dark brown and is very moist and rather 

 firm. The blood is coagulated, forming coagula of chicken-fat 

 consistence. 



The spleen weighs 330 grams. It is firm and about normal in 

 shape, and the capsule is pale gray. It cuts readily, showing 

 a smooth, very compact dark brown surface, which is not very 

 moist, and upon the surface the strands of interstitial tissue 

 are visible. 



The adrenals weigh 12 grams and are apparently normal. 



The kidneys weigh 192 grams. They are about normal in 

 shape and consistence. They cut easily, and the cut surface 

 bulges. Upon the cut surface the pyramids are about normal 

 in size, compact, and pale with reddened outline, while the cortex 

 is pale with red linear marking. The capsule strips veiy easily, 

 exposing a pale surface marked with numerous stellate injec- 

 tions. 



The contents of the small intestine vary from a thick, creamy 

 yellowish brown material in the jejunum to a thick blackish 

 fluid in the lower ileum. The contents of the colon vary from 

 a thick black fluid in the ascending and transverse colon to a soft, 

 semisolid, thick, turbid black fluid in the descending colon. 

 Trichurides are present. 



The walls of the colon are somewhat thickened and are 



