18 



changed to a diphtheritic membrane. It putrid panophthalmia appeared, the 

 bulbus oculi shrank ; the corpus vitreum became grey with pus, and partially 

 softened'; and the retina was in shreds. 



In birds that were suffering clinically from pneumonic dispnoea, and often 

 in those that had not shown any symptoms of disease of the lungs, the post- 

 mortem examination revealed extended pneumonic patches. 



In the region of this inflammation, the branches of tracheae were stopped 

 with firm, yellowish-white masses o'f exudation. Often in the centre of the 

 pneumonic region, a mass of cheesy matter (from 1-2 cubic centimetres in size) 

 was found connected with the masses in the branches of the trachea. These 

 masses of cheesy matter were separated from the lung tissues by a brownish- 



Fig. 11. — Head of hen 35, 8 clays after inoculation with a culture 

 of the Roup bacillus. a. Cheesy matter projectini; from 

 between the soiled and featherless eyelids. Nostrils are closed 

 by a crust of dried secretion. 



red granular membrane. The more peripheral parts of the diseased lungs were 

 usually normal, or oedematous. The changes in the lungs were often accom- 

 panied by cheesy exudations into the pleural folds betweeen heart and lungs. 

 These grew to 3 cm. in length and were often i cm. in thickness and breadth. 

 They were always covered by pleura. The latter, however, changed to a 

 brownish, pyogenous membrane, from 1-5 millimetres thick. It was smooth 

 on the outside, but the side, turned towards the exudation, was somewhat un- 

 even, and covered with gray pus. Twice in the pericardium (diseased fowls 6 

 and 18) a somewhat grey, serous-purulent exudation was present. The peri- 

 cardium and epicardium were gray. Firm, cheese-like exudation masses were 

 often met with in the folds of the mesentery, between the intestines, gizzard 

 and stomach. In fowls 4 and 18. the mucous membranes of the intestines were 

 haemorragicallv inflamed. 



