DISEASES OF SHEEP. ^ 33 



disease also results from sudden colds in summer, when the 

 atmosphere after a thunder-storm, and especially after a 

 hail-storm, suddenly cooled off; also from colds at the 

 washing and bathing of sheep, or from exposure when the 

 sheep remain in sheepfold upon meadows which previously 

 had been filled by rain. 13. The inhalation of swamp air 

 in the neighborhood of small streams caused the spreading 

 of this disease. 14. It appears that young sheep up to 

 their fourth year are mostly disposed to suffer from this 

 disease. 15. The disease is generally taken by the fattest 

 and most playful animals of the herd. 



A decrease or entire disappearance of this disease is ob- 

 served under the following circumstances : 1. During the 

 cold season. If the weather during summer-time continues 

 to be cool, continuous rain causes the disease to disappear 

 entirely. 2. It was observed that not a single case occurred 

 amongst one part of a certain herd which was in stables 



^and fed with dry food, whereas the other part of the same 

 herd was feeding upon the meadow. When the animals 

 were taken from the meadow into the stable, a decrease 

 and entire disappearance of the disease took place, as like- 

 wise when the herd was transferred from rich and abundant 

 to barren pastures, from tne valley to the hill, or to such pas- 

 tures as contained little or so-called acidulous food. It has 

 been generally observed that the disease abated as soon as 

 a change was effected, whether it arose from a transfer to 

 different pastures, which produces a change of mastication 

 and nourishment, or from a change to different places. 

 Diseased animals have been cured by allowing them to feed 



, upon potatoes. 3. Old or lean sheep are not so often 

 afflicted with said disease as young or fat animals. 



As in all epidemic diseases, it may be questioned whether 

 this blood disease is not also of a contagious character. 

 It has been proven that when healthy sheep have been 



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