302 A Pathogenic Schizophyte of the Hog. [April, 



in the enlarged or swelled lymphatic glands, than in any other 

 part of the animal's body. 



8. In one and the same affected herd the older or more fully 

 matured animals often recover, while nearly every young ani- 

 mal and particularly nearly every young pig under three months 

 old, if once infested, will succumb to the disease, and is 

 almost sure to die. This also may be considered as proof that the 

 Schizophytes, or rather their zooglcea-masses cause the disease 

 by obstructing the capillaries. In older, and otherwise robust 

 hogs the heart and the walls of the blood vessels are much 

 stronger than in young pigs, and so it often happens that in the 

 former the force of the blood current is strong enough to break 

 and to disperse the zooglcea-masses, and thus to free the ob- 

 structed passages, while in young, and especially in very young 

 animals the pressure or the force of the blood current is insuf- 

 ficient, and then the passage is not freed, and exudation takes 

 place, or the walls of the blood vessels are too weak, and then 

 the latter yield and break and blood is extravasated. Usually 

 both processes occur. Hence, while blood-extravasations in. the 

 lungs, arc, as a rule, more frequent in young animals, other mor- 

 bid changes brought about by Schizophytes, which have passed 

 tine capillary system in the lungs, and are forming their zooglcea- 

 masses in other parts or organs of the body, are on the whole 

 more frequently met with in older hogs. Still, the latter, not- 

 withstanding, have a much better chance of recovery than the 

 former. 



9. An animal which is recovering from an attack of swine- 

 plague, or in which the morbid process has ceased to be active, 

 will yet for sometime discharge swine-plague Schizophytes with 

 its excretions, and is able to communicate the disease to other 

 healthy animals by polluting their food or water for drinking, 

 consequently the organism of such an animal is not destitute of 

 the infectious principle, but contains an abundance of the same in 

 a potent condition, while its own tissues have become sterile, or 

 are not any more acted upon, because some of the conditions re- 

 quired by the Schizophytes to form zooglcea-masses and to pro- 

 pagate have become exhausted. In the lungs of an animal which 

 was butchered two months after recovety, I found an abundance 

 of swine-plague Schizophytes, but no zooglcea-masses. These 

 facts, too. will be difficult of explanation, if a chemical poison or 



