EPITHELIOMA CONTAGIOSUM 539 



first with pure lymph, later with pus; these shortly dry to dark 

 brown scabs which fall off after a few days. In more severe 

 cases the pustules became confluent. 



The diagnosis between this affection and the different 

 forms of eczema, erysipelas and urticaria is not easy. There 

 is mucli need of further investigation of this group of diseases. 



REFERKNCES. 



1. Berrv. Contagious pustular dermatitis of sheep. 



2. BORREL. Etude experimentale de la clavelee filtration du 

 virus ; Sero-clavelisation ; Serotherapie. .Inn. de I' Inst. Pasteur, Vol. 

 XVII (,1903), p. 123. 



3. Councilman, Magrath and Brinckerhoff. The patho- 

 logical anatomy and histology of variola. The Journal of Jfedicat 

 Research, Vol. VI (1904), p. 12. 



4. DuPuis. Colques cas de cow-pox : Eruption gendralisee. 

 Annals de J/ed. Vel., 1889, p. 185. 



5. EiLERTS DE Haan. Vaccine et retrovaccine a Batavia. Annals 

 de V Inst, Pasteur, 1896, p. i5g. 



6. HiME. Successful transformation of small-pox into cow-pox. 

 British Medical Journal, 1892, p. Ii5. 



7. Noc.ARD. Etudes experimentales sur la clavelee. Bulletin de 

 la Societi Cent. Mi-d. Vet., 1899, p. 263. 



8. Simpson. Vaccinia produced by passing the vaccine of small- 

 pox. Indian Medical Gazette, 1896, p. 205. 



EPITHELIOMA CONTAGIOSUM. 



Synonyms. Chicken pox ; la petite verole; sore head.. 



§ 426. Characterization. Epithelioma contagiosum, 

 or chicken pox as it is more commonly called in this country, 

 is characterized by the development of nodular-like growths 

 upon the mucosa and skin of the head and neck. It is readily 

 transmitted among fowls. Other birds especially pigeons are 

 said to be affected. 



§ 427. History. This affection of fowls has been known 

 for a long time. It was thought in early times that it was re- 



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