Vlii Kiri.TKV DISKASKS AM) T 1 1 K I K TKlvATMENT. 



Fig. I'). Throat ami lidtlotii of mouth with false membrane pack 

 [III) 14 (lays after inoculation. (From Harrison 



and Streit ) 95 



I'ig. JO. A section of a false membrane of a roupy fowl. ( From 



Harrison and Streit) 96 



Fig. Ji. Head of a bird witli diphtheritic roup atTecting tlie 



mouth and tongue. (From Megnin) 96 



Fig. JJ. .Is/^crc/illus fuiiiiinUus. (.reatly enlarged. (.\fter 



Mohler and P.uckley) 106 



Fig. -'3. CytoiUlcs inuliis. The air sac mite, (.\ftcr Theo- 

 bald) no 



Fig. _M. The common hen louse {Meiiopon pallidum ). Greatly- 

 enlarged. (From lianks) 126 



Fig. 25. Lipi-urus z'liriabilis. A louse that infests poultry. Much 



enlarged. ( From Banks after Denny) 127 



Fig. 26. Goniodcs dissiiiiilis. 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, Dennaiiyssus gal- 



niiic. (.\fter Osborn) I33 



Fig. 29. A. Xormal 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 ) i37 



Fig. 31. Photograpli of tlie adult female of the mite Knemido- 



coptcs (Dcnuatorycics) muians. After Haiduk).. 138 



Fig. 2i-- Photograph of the six-legged larvae of Kneinidocoptes 



(Dcnnatoryctes) miitans 139 



Fig- 2i3- Section of the skin of the leg of a fowl affected with 



scaly leg. Enlarged. (After Haiduk) 140 



Fig. 34. Egg containing female Sarcoptcs laciis var. gallinac. 



( Fn mi Theobald) 142 



Fig. 2S- Syiiiplectoples cysticola. Connective tissue mite. 



(After Theobald) 144 



Fig. 36. "Harvest bug," Tetranychns (Leptus) aiitumitalis, lar- 

 val form. (After Murray ) 145 



Fig. S7- Head and neck of a fowl affected witli generalized 



favus. (.After Pearson) 147 



Fig. 38. The fungus Achorioii sclioiilcinii which causes favus 



in poultry 148 



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



Cary) 151 



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



(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 



