192 EDWARD JENNER 



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subject from tlie Rev. Mr. Moore, of Chalford Hill, in 

 county : 



" In the month of November, 1797, my horse had dis- 

 eased heels, which was certainly what is termed the grease ; 

 and at a short subsequent period my cow was also affected 

 with what a neighbouring farmer (who was conversant with 

 the complaints of cattle) pronounced to be the cow-pox, 

 which he at the same time observed my servant would be 

 infected with: and this proved to be the case; for he had 

 eruptions on his hands, face, and many parts of the body, 

 the pustules appearing large, and not much like the small- 

 pox, for which he had been inoculated a year and a half 

 before, and had then a very heavy burthen. The pustules 

 on the face might arise from contact with his hands, as he 

 had a habit of rubbing his forehead, where the sores were 

 the largest and the thickest. 



" The boy associated with the farmer's sons during the 

 continuance of the disease, neither of whom had had the 

 smallpox, but they felt no ill effects whatever. He was 

 not much indisposed, as the disease did not prevent him 

 from following his occupations as usual. No other person 

 attended the horse or milked the cow but the lad above 

 mentioned. I am firmly of opinion that the disease in the 

 heels of the horse, which was a virulent grease, was the 

 origin of the servant's and the cow's malady." 



But to return to the more immediate object of this propo- 

 sition. 



From the similarity of symptoms, both constitutional and 

 local, between the cow-pox and the disease received from 

 morbid matter generated by a horse, the common people in 

 this neighbourhood, when infected with this disease, through 

 a strange perversion of terms, frequently call it the cow-pox. 

 Let us suppose, then, such a malady to appear among some 

 of the servants at a farm, and at the same time that the 

 cow-pox were to break out among the cattle; and let us 

 suppose, too, that some of the servants were infected in 

 this way, and that others received the infection from the 

 cows. It would be recorded at the farm, and among the 

 servants themselves wherever they might afterwards be 

 dispersed, that they had all had the cow-pox. But it is 



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