ASTHENIA IN FOWLvS AND PIGEONS 1 67 



of the lesions in the walls of the intestine will be quite suffi- 

 cient to determine the nodular disease. 



REFERENCES. 



1. Cherry and Bull. Caseous lymphatic glands (pseudo-tubercu- 

 losis) in sheep. The Veterinarian. Vol. LXXII. p. 523- 



2. Eberth, C. J. Bacillare Nekrose der Leber. Vtrchow's Arcfiiv., 

 Bd. C. (i8S5)p.'23. 



3. Norgaard and Mohlkr. The nature, cause, and economic 

 importance of ovine caseous lymph-adenitis. Sixteenth Annual Report, 

 Bureau of Animal Industry. 1S99. p. 638. (Full bibliography). 



4. Preisz and Guinard. Pseudo-tuberculose chez le mouton. 

 /ourn. de med. de vet. et de zodtech. ser. 3, Vol XVI. ( 1S91) p. 563. 



5. Preisz. Recherches comparatives sur les pseudotuberculoses 

 bacillaires et une nouvelle espec de pseudotuberculose. Ann. de V Inst. 

 Pasteur, Vol. VIII. {1S94) p. 231. 



6. SivoRi. Sur une broncho-pneumonie caseouse du mouton, causee 

 par le bacille de Nocard-Preisz. Rev. de vied. vet. ser. 8, Vol. VI. 

 (1S99) p. 657. 



ASTHENIA IN FOWLS AND PIGEONS. 



§126. Characterization. This is a disease especially 

 of chickens and pigeons in which there is marked emaciation 

 and a failure to take on flesh even when fed on the most 

 nourishing food. Because of this, the disease has received the 

 popular name of "going light." 



§ 127. History. Although this condition or disease has 

 been recognized for a long time it seems to have been first 

 described in 1898 by Dawson. He gives a brief account of the 

 symptoms, morbid anatomy, etiology and a somewhat ex- 

 tended description of the specific organi.sm which he isolated 

 from the diseased chickens. The writer has studied this 

 affection in pigeons but did not succeed in finding the organism 

 isolated by Dawson. 



§ 128. Etiology. Dawson found this ^^^^^^^ ^ 



disease to be due to the presence of a certain ^^ ^ 



species of bacterium which he obtained in ^ ^ ^ 

 pure culture from the duodenal contents. He 

 described it as Baderhwi asthenice. This 

 organism varies from i to 1.3// in length and 

 about 0.5// in width with rounded ends. It Fig. 38. Bacter- 

 is reported to possess the peculiarity of vege- ///;;/ as the n ice. 

 tating in temperatures varying from 50 to [Dawson.) 



