Viii POULTRY DISEASES AND THEIR TREATMENT. 



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

 {m) 14 days after inoculation. (From Harrison 



and Streit ) 95- 



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



Harrison and Streit) 96- 



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



mouth and tongue. (From Megnin) 96 



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



Mohler and Buckley) 106 



Fig. 23. Cytodites nudiis. 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 gal- 



niae. (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 139 



Fig. 2>i- Section of the skin of the leg of a fowl affected with 



scaly leg. Enlarged. (After Haiduk) 140 



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



(From Theobald) . 142 



Fig. 35. Syniplectoptes cysticola. Connective tissue mite. 



(After Theobald) 144 



Fig. 36. "Harvest bug," Tetranychiis (Leptus) autumnalis, lar- 

 val form. (After Murray) 145. 



Fig. 2>7- Head and neck of a fowl affected with generalized 



favus. (After Pearson) , 147 



Fig. 38. The fungus Achorion schonleinii which causes favus 



in poultry 148 



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



Gary) 151 



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



(After Duval) 156 



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



(From von Durski after Landois) 161 



Fig. 42. Triple yolked egg. (Original) 176 



