228 



DISEASliS OF POULTRY. 



O, 



generally resultin.u in death in from four to five days. 

 In some cases the duration of the disease is longer and 

 two or three weeks may elapse before the death of the 

 bird. There is then excessive emaciation. A micro- 

 scopic examination of the blood shows a marked 

 diminution in the num])er of red corpuscles and an in- 

 crease iti the number of white ones. In one case the 

 red corpuscles 

 decreased from 

 3,744,000 per 

 cubic millimeter 

 to 2,133,000, 

 and the white 

 ones increased 

 from 21,000 to 

 14 0,000. In 

 another case the 

 red corimscles Fig 

 were diminished 

 from 3,534,000 to 1,745,000, while the white ones 

 increased from 19,000 to 245,000. There is loss of 

 appetite with slight ruffling of the plumage, and the 

 head drawn close to the 1)ody. There appears to be 

 no diarrheal symptoms with this disease, or if thej'^ are 

 sometimes seen they may be regarded as exceptional. 

 The period of incul)ation is from two to four daj'S. 

 The alterations discovered hy post inorlcDi examination 

 are confined to the liver and the blood. The liver is 

 somewhat enlarged and dark colored, and the surface 

 is sprinkled with minute graj'ish areas. 



C.\uSATiON. — This disease is undoubtedly infectious 

 and is caused by a micro-organism which Moore has 

 named Bat to inm sa>i,i;i/ina)iu)ii . This germ is a non- 

 motile, rod -shaped organism, which as found in the 





69. — Bacterium siiiigiiiiit)iii:iii from li^cr of 

 fowl, iiiafrnified 2,(Iiki diameters . 



