44: THE DISEASES OF DOMESTIC ANIMALS. 



dried on quills for one day ; one with the same kind of virus that 

 had been dried four days, another with virus that had been dried 

 five days, and another with virus that had been dried for six days. 

 The quills had been sent from New Jersey and North Carolina, 

 without any special protection. Of the six inoculations four gave 

 positive results, while two, in which the quills were subjected to the 

 action of disinfectants, gave negative. 



Virulence of Dried Intestine. — Pieces of dried intestine, which 

 had been dried for three and four days each, were used for inocula- 

 tion, and gave positive results. 



Virulence of Moist Morbid Products if secluded from the Air.. 

 — In these experiments a pig was inoculated with a piece of in- 

 testine sent from Illinois in a tightly corked bottle. The specimen 

 had been three days from the pig, and had a slightly putrid odor. 

 The disease developed on the sixth day. 



A second pig was inoculated with blood from a diseased pig 

 that had been kept for eleven days at 100° Fahr. in an isolation ap- 

 paratus, the outlets of which were plugged with cotton-wool. Ill- 

 ness followed in twenty-four hours. 



These experiments go to prove that the exclusion of air, or re- 

 tarding of putrefaction, probably favors the longer preservation of 

 the inficiens. 



Probable Non-Virulence of Morbid Products that have under- 

 gone Putrefaction. — This seems to be proved by direct experiment. 



Virulence of the Blood. — Law produced positive results by ex- 

 periments upon two pigs, which is opposed to the single experiment 

 of Klein ; but Law does not know but that at certain stages of the 

 disease the blood may be non- virulent. 



Infection by means of the air does not seem to be clearly proved. 



Transmissions of the disease to other animals than the hog for 

 inoculation seem all to be followed by positive results in sheep, 

 rabbits, and dogs ; and Klein succeeded in producing it in rabbits, 

 Guinea-pigs, and mice. 



Seasons and Temperatures. 



Experience has proved the extension and devastations of this 

 disease to be the most extreme in the late summer and early fall 

 months ; but the cold weather of winter does not seem to be able 

 to put that check to its ravages which occurs under, the same condi- 

 tions with other diseases of a somewhat similar nature. 



Detmers says : " While, therefore, the very severe weather of 

 the past winter caused a great reduction in the number of animals 



