DIPHTHERIA IN FOWLS 325 



known as the "virus of street rabies." Such virus will as a 

 rule produce the disease in rabbits by intra-crauial inoculation 

 in from three to four weeks. By inoculating rabbits in series 

 one from the other, a reduction of the period of incubation is 

 obtained. After about 100 passages rabbits will die with cer- 

 tainty and great regularity on the sixth or seventh day after 

 inoculation. Beyond this point no increase of virulence has 

 been obtained. This is the fixed virus of Pasteur. 



REFERENCES. 



1. Babes. Sur certains caracteres des lesions histologiques de la 

 rage. Ann. de V InstihU Pasteur. Vol. VI. 209-223. 



2. Cabot. Report on experimental work on the dilution method 

 of immunization from rabies. Jour. Experimental Med. Vol. IV. 1899. 



3. Dulles. Disorders mistaken for hydrophobia. Trans, of the 

 Med. Soc of the State of Fen n. 18S4. 



4. Fleming. Rabies and hydrophobia. 



5. KeirlE. a report on the autopsies on four recent cases of 

 rabies and a bacteriological examination of a rabid dog, together with 

 the recent laboratory experiments. Maryland 3Ied Jour. Vol. XXXVIII. 



No. I. 1897. 



6. Law Rabies. A System of Practical Medicine by American 

 Authors. Vol. III. 1898. 



7. M.\cClure. Rabies-hydrophobia. Supplement to the Annual 

 Report of the Michigan Board of Health. 1895. 



8. Moore and Fish. .\ report on rabies in Washington, D. C. 

 Annual Report, U. S. Bureau of Animal Industry. 1895-6. 



9. Public Health Commission, District of Columbia. Rabies. 

 Bui. 2j. U. S. Bureau of Animal Industty. 1900 



10. R.WENEL AND McCarthy. The rapid diagnosis of rabies. 

 Univ. of Penn. Med. Magazine. January. 1901. 



11. Ravenel. Rabies Bul.jg. Dept. of Agr., State of Penn. 1901. 



12. S.^LMON. Rabies, its cause, frequency and treatment. Year 

 Book, Dept. of Agriculture. Washington, D. C. 1900. 



13. Salmon. Rabies in the District of Columbia. Circular 30, 

 U. S. Bureau of Animal Industry. 1900. 



14. SuzoR. Hydrophobia. An account of M. Pasteur's system. 1887. 



15. Wesbrooic. Preliminary report on the laboratory diagnosis in 

 twenty cases of suspected rabies. Trans. Am. Public Health Assn. 



898. 



DIPHTHERIA IX FOWLS. 



§ 244, Characterization. Diphtheria of birds is an in- 

 fectious disease the lesions of which first appear on the mucous 

 membrane of the nasal passages, the eyes, the mouth, the 

 pharynx and larynx and which may extend to the trachea, 

 bronchi, the air-sacs, the intestines and possibly to other 



