1. Importance of controlling disease. 2. Dangers of introducing disease. 3. Control measures. 4. Nursing sick birds. 5. The use of drugs and medicines. 6. Disinfection. CHAPTER II SUMMARY OF EXTERNAL SYMPTOMS AND TREATMENT 14 1. Diseases affecting head and respiratory organs. 2. Diseases affecting organs of digestion and reproduction. 3. Diseases affecting legs and feet. 4. Parasites. 5. Miscellaneous. CHAPTER III DISEASES OF POULTRY OTHER THAN FOWLS 19 CHAPTER IV DISEASES AND PESTS OF FOWLS 22 (In alphabetical order.) CHAPTER V POST-MORTEM EXAMINATIONS 99 1. Making the examination. 2. The normal condition of the internal organs. 3. Diagnosis of disease by post-mortem symptoms. LIST OF ILLUSTRATIONS FIG. PAGE Profit or Loss _Frontispiece_ 2 Isolation 5 3 Desolation 6 4 Poultryman’s Medicine Shelves 8 5 How Disease Is Spread 10 6 Aids to Thorough Disinfection 12 7 Head Showing Brain Exposed 29 8 {Windpipe Cut Open } 30 {A Fungus That Causes Aspergillosis } 9 Bumblefoot 36 10 Chicken Pox 38 11 Diphtheritic Roup 50 12 {Chicken Affected with Gapes } 60 {Gape Worms } 13 Looking for Lice 67 14 Three Lice That Commonly Affect Fowls 68 15 The Air-Sac Mite 74 16 The Depluming Mite 74 17 The Red Mite 75 18 Organs of Reproduction of the Hen 78 19 Examining a Fowl with a Suspicious Cold 84 20 A Roupy Eye 87 21 Scaly Leg 88 22 The Mite That Causes Scaly Leg 89 23 The Fowl Tick 90 24 Organs Affected by Tuberculosis and Blackhead 91 25 Chickens Affected with White Diarrhea 93 26 Healthy Chickens 93 27 Worms in Intestinal Tract of Fowl 95 28 The Parts of a Fowl 96 29 Skeleton of a Fowl 97 30 Post-Mortem Examination No. 1 100 31 Post-Mortem Examination No. 2 102 32 Post-Mortem Examination No. 3 104 33 Post-Mortem Examination No. 4 106 34 Post-Mortem Examination No. 5 110 CHAPTER I GENERAL METHODS OF CONTROLLING DISEASE _1. Importance of Controlling Disease_ The ravages of disease add considerably to the difficulties of raising poultry in all parts of the world. It is the experience of poultry rearers that an annual toll has to be paid in the lives of young birds and older stock. Sooner or later, in addition, an epidemic may break out and result in heavy losses and much discouragement.