CONTAGIOUS DISEASES OF DOMESTICATED ANIMALS. 9 



This cow died during' the night of January 11, and was examined 

 about 11 o'clock the following day. On opening the thorax about 2 

 gallons of amber-colored liquid escaped. The right lung was solidly 

 attached to the costal pleura and diaphragm by thick false membranes 

 of recent formation. On the left side the attachments were not so ex- 

 tensive, and the membranes were of still more recent growth. On each 

 side there were thick masses of coagulated lymph, weighing from 2 to 

 3 pounds, and of a whitish color and firm consistency, which indicated 

 their formation a number of days before the death of the animal. The 

 lung tissue presented no signs of hepatization. 



The second cow examined was brought to the Station over two 

 mouths before, and at the time of this examination was somewhat 

 emaciated. She was coughing when tirst seen, had little appetite, and 

 an examination of the lungs showed dullness and loss of respiratory 

 murmur over the lower ])art of the right lung. 



Three animals had j^reviously been lost in the stable from which she 

 came, and before death they presented symptoms of Inng disease. 



This cow was slaughtered, and on opening the cavity of the thorax 

 the left lung was found adherent to the diai)hragm and the riglit lung" 

 to the costal pleura. The right lung contained four or five masses, 

 varying from two to four inches in diameter, surrounded by a thin cyst 

 wall and composed of hepatized lung tissne in a disintegrating condi- 

 tion. 



The third animal, which was also somewhat emaciated, was obtained 

 January 10, from a stable where two cows had been lost in the preited- 

 ing summer. She had been purchased for $30 two or three months 

 before she sickened, and was at that time in good health. When 

 brought to the station her temperature was 101° F., and there was com- 

 plete dullness and loss of respiration over the left lung. Tier condition 

 was substantially the same on ths day of examination, January 12. 

 When, after slaughter, the ribs of the left side were removed, a consid- 

 erable quantity of amber-colored liquid escaped. This lung was com- 

 pletely hepatized and solidly attached to both the ribs and diaphragm. 

 A section of the lung disclosed the interlobular tissue distended with 

 lym])h, though not to the degree sometimes seen. There was, how- 

 ever, a very distinct marbled ap])earance, and a difference of coloration 

 between the upper and lower parts of the lung that probably resulted 

 from a difference in the age of the hei)ati/.ati()n in these two ])ortions. 

 The right lung of this animal was in a normal condition. 



A fourth cow was obtained from a Washington stable the same day 

 that the above examinations were made. She died during the night of 

 January 12. Her a|>[)earance before death and the condition of her 

 lungs when examined were very similar to that of the third cow men- 

 tioned above. 



May 1, 1884, a sick cow was reported at Miss Fannin's, on M stree^^ 



