Viii POULTRY DISEASES AND THEIR TREATMENT. 



Fig. 19. Throat and bottom of mouth with false membrane page 



(;;;.) 14 days after inoculation. (From Harrison 



and Streit) ' 95 



Fig. 20. A section of a false membrane of a roupy fowl. (From 



Harrison and Streit) 9& 



Fig. 21. Head of a bird with diphtheritic roup afifecting the 



mouth and tongue. (From Megnin) 96 



Fig. 22. Aspergillus fuinigatus. Greatly enlarged. (After 



Mohler and Buckley) 106 



Fig, 23. Cytodites nudus. The air sac mite. (After Theo- 

 bald) no- 

 Fig. 24. The common hen louse (Menopon pallidum). Greatly 



enlarged. (From Banks) 126' 



Fig. 25. Lipcurus variabilis. A louse that infests poultry. Much 



enlarged. (From Banks after Denny) 127 



Fig. 26. Goniodcs dissimilis. A louse that infests poultry 



Much enlarged. (From Banks after Denny) 127 



Fig. 27. Feathers showing eggs or "nits" of the common hen 



louse. Enlarged. _ (Original) 128 



Fig. 28. The common "red mite" of poultry, Dermanyssus gai- 



niac. (After Osborn) 133 



Fig. 29. A. Normal leg of hen. B. Leg of hen affected with 



scaly leg. (After Megnin) 136 



Fig. 30. Photograph of the leg of a hen affected with scaly leg. 



(After Haiduk) 137 



Fig. 31. Photograph of the adult female of the mite Knemido- 



coptes (Dermatoryctes) mutans. After Haiduk) . . 138 



Fig. 32. Photograph of the six-legged larvae of Knemidocoptes 



{Dermatoryctes) mutans 13P 



Fig. 33. Section of the skin of the leg of a fowl affected with 



scaly leg. Enlarged. (After Haiduk) 140 



Fig. 34. Egg containing female Sarcoptes laevis var. gallinae. 



(From Theobald) 142 



Fig' 35- Symplectoptes cysticola. Connective tissue mite, 



(After Theobald) 144 



Fig. 36. "Harvest bug," Tetranychus (Leptus) autumiialis, lar- 

 val form. (After Murray) j^r 



Fig. 37. Head and neck of a fowl affected with generalized 



favus. (After Pearson) 147 



Fig. 38. The fungus Achorion schonleinii which causes favus 



in poultry ^^g 



Fig. 39. Sore-head crusts on comb, eye-lids and skin (After 



Gary) ' ^^^ 



Fig. 40. The reproductive or egg-producing organs of a hen 



(After Duval) ' g 



Fig. 41. Showing shapes of abnormal eggs sometimes ' found. 



(From von Durski after Landois) igi 



Fig. 42. Triple yolked egg. (OriginaO g 



