POUI.TRY DISEASKS AND THEIR TREATMENT. 



93 



eyes and the nostrils ; and this swelHng, which is hot and sore, 

 sometimes grows into a tumor as large as a walnut — generally 

 firm and hard. (See fig. i6). A bird in this condition is 

 frequently found scratching at the tumor with its claws or 

 wings, as if endeavoring to remove it. If the tumor grows on 

 the inner side, towards the nasal passage, it forces the roof of 

 the mouth downward, and the upper and lower beak are slowly 

 pressed out of their normal position, so that the bird cannot 

 close its mouth." 









..^- ' 



.^ 



Fig. 17. Head of a bird. Tlie lower figure 

 shows the maxillo-ocular sinus, which opens 

 into the socket of the eye and communi- 

 cates with the nasal cavities. The upper 

 figure shows the roup tumor on the head 

 caused by the filling of this cavity with 

 cheesy pus. (From Megnin). 



"On making an incision into the tumor, we find a solid, cheesy, 

 yellowish matter, which may be pulled out like the root of a 

 plant; but it usually has to be broken into small pieces in order 

 to get it out. Around this mass, there is a more or less smooth, 

 grey or brownish membrane that is capable of again forming a 

 chee.sy mass similar to what has been removed." 



"The mass itself, when not attended to, often grows into the 

 nasal canals, and blocks them up completely. Generally com- 



