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II. Some observations on the Migration of Birds. By the late 
Edward Jenner, M. D. F. R. S. ; with an Introductory 
Letter to Sir Humphry Davy, Bart. Pres. R. S. By the 
Rev. G. C. Jenner. 
Read November 27, 1823. 
Sir, 
Xt had long been the intention of my late revered Uncle, 
Dr. Jenner, to lay the accompanying observations on the 
Migration of Birds, before the Royal Society, as well from 
inclination, as to redeem a pledge he had given some years 
ago to that learned Body ; but which he was unable to ac- 
complish, in consequence of his extensive correspondence 
with almost every part of the globe on the interesting subject 
of Vaccination, which occupied nearly the whole of the time 
his more immediate professional avocations would allow him 
to bestow on other objects. 
It was my peculiar happiness .to accompany Dr. Jenner in 
most of his investigations of the phenomena of migration ; 
and the Paper I have now the honour of presenting, was left 
in my hands at the time of his decease. 
Had it pleased Providence to have spared him a little 
longer, he might, probably, have corrected some inaccuracies 
in the style and order of his Paper, that may now, perhaps. 
