VI. Part of a letter from the Reverend Mr. W. Derham, F. R. S. To Dr. Hans Sloane, R. S. Secr. concerning the migration of birds

Abstract

I Remember that some time since, I promised to suggest a thing to the Society relating to the Migration of Birds, which I conceive may conduce to the Discovery of that pretty Phœnomenon ; and I am sorry I forgot it till the Jynx (just now come) hath brought it to my Thoughts.