BY DR. OSCAR KATZ. 567 



and December 1st, respectively. The carcasses remained there 

 until December 14th (see above). 



Now, with regard to the poultry, penned up in the same aviary, 

 I have to state that within the five weeks there died : six pigeons 

 and hvo fowls. However, early on Nov. 10th, i.e., very soon after 

 the beginning of the experiment, two pigeons which were ailing 

 before, were found dead. Leaving these two out altogether, the 

 mortality, and the result of j^ost-mortem examination, is as fol- 

 lows : — 



November 13th — One hen found dead at 7.30 a.m. P.M., Negative. 

 November 17th — One pigeon found dead. P.M., Negative. 

 November 29th — One rooster found dead at 7.30 a.m. P.M., Negative. 

 December 7th — One pigeon found dead at 8 a.m. P.M., Negative. 

 December 11th — One pigeon found dead at 8.30 a.m. P.M., Negative. 

 December 14th — One pigeon found dead at 8 a.m. P.M., Positive. 



(Characteristic appearance of organs : immense numbers of chicken- 

 cholera bacteria in blood. Rabbit inoculated with small quantity of 

 this blood perished from "chicken-cholera" in less than 10 hours after 

 inoculation). 



Thus, it was only once, namely in the case of the last pigeon, 

 that the disease was communicated.'^ This result appears to 

 rabbits dying and dead from " chicken-cholera," is not great under 

 indicate that the danger to poultry which are associated with 

 those conditions. 



It must be mentioned that during the term of the experiment 

 both fowls and pigeons were observed to peck freely at the dead 

 rabbits lying about. When the latter were removed ultimately, 

 the three rabbits which had died first, presented only fragments 

 scattered in difi'erent directions. The two which died last, were 



* After December 14th, another death occurred in the aviary, namely 

 that of a hen which was found dead at 7 a.m., December 15th. The result 

 of the P.M. examination, and the successful inoculation of some heart- 

 blood of this hen into a healthy rabbit, was undoubted proof of death being 

 due to chicken-cholera. It cannot, however, be decided whether this hen 

 died in consequence of infection from the dead rabbits which were in the 

 aviary up to December 14th, or of infection from the droppings of the 

 pigeon which, having been found dead on the last-mentioned date, was 

 shown to have succumbed to chicken-cholera. 



