To 

 C. H. PARRY, M.D. 



AT BATH 

 MY DEAR FRIEND: 



In the present age of scientific investigation it is remarkable 

 that a disease of so peculiar a nature as the cow-pox, which has 

 appeared in this and some of the neighbouring counties for such 

 a series of years, should so long have escaped particular atten- 

 tion. Finding the prevailing notions on the subject, both among 

 men of our profession and others, extremely vague and inde- 

 terminate, and conceiving that facts might appear at once both 

 curious and useful, I have instituted as strict an inquiry into the 

 causes and effects of this singular malady as local circumstances 

 would admit. 



The following pages are the result, which, from motives of 

 the most affectionate regard, are dedicated to you, by 

 Your sincere friend, 



EDWARD JENNER. 

 BERKELEY, GLOUCESTERSHIRE, 

 June 21 st, 1798. 



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