90 



pori.Tin I)im:.\si:s and tiii:iu iKr.ATMKXT. 



Fig. 20. A section of a false mcr.il)rane of a roupy fowl, (a) — false 

 membrane; (b), cpitbeliuni: (c), sub mucosa. (From Harrison and 

 Streit). 



A.- 

 B- 



^*^ 



•:-.,.^ 





il^ 



Fig. 21. Head of a bird witb diytheritic roup affecting the 

 mouth and tongue. A. B, C and D. — False membranes. 

 (From Mcgnin). 



"We may al.so point out that many poultry kceper.s who notice 

 the false nicm])ranr on the tliroat and mouth of their fowls, 



