120 PROTESTS AND DISEASE 



A case in which a lady appears to have caught the 

 disease from a canary has been recorded, so Dr. Fernet 

 informs me. 



Marx and Sticker found the virus to be filtrable by a 

 Berkefeld filter. They found it more resistent to cold, sun- 

 light, drying, and heat than any other filtrable virus. The 

 filtrate dried in vacuo resisted heating to 100 C. Passage 

 of the virus from pigeons through hens diminished virulence 

 for pigeons. An extensive attack conferred immunity. 



Burnet found that inoculation of the cornea produced 

 bodies like the Guarnieri bodies in the vaccinated cornea. 



L. Pfeiffer found that in hens and turkeys the disease 

 ran a chronic course and the lesions were confined to the 

 comb, wattles, &c., not invading the mouth. Young pigeons 

 are especially disposed : tumours as large as hazel-nuts 

 forming about the head and anus. Lesions form at the 

 angles of and inside the mouth, sometimes extending along 

 the trachea and intestine and causing rapid death. Pfeiffer 

 found a close relationship between molluscum and what 

 he named flagellate- diphtheria in pigeons, an affection in 

 which diphtheria-like membranes cover the mucosa of the 

 mouth, trachea, and intestines. Millions of flagellates crowd 

 the membranes. He identified them with Trichomonas. 

 His drawings show large multinucleate bodies with one or 

 two flagella, some appear to have been attached by a 

 pedicle. In view of the flagellate bodies which I saw 

 develope in water-cultures of human molluscum Pfeiffer' s 



