LETTERS FROM THE REV. WM. DERHAM, D D. 
179 
y 4 contains it. There is I think a cut of it in the Acta , not very 
different from mine in Trans. N r : 310. If it will not be incon¬ 
venient I would beg the fav r of you to lend me a vol : or two of 
the Acta, w ch shall not be detained as your Willug : was. 1 believe 
I have perused one or two of the first vol : & should be glad then 
to see some of the rest. I am 
S r 
Your much obliged humble Serv 4 
W. Derham. 
I am not able to read the word after “ great.” Among the 
forty odd contributions from Dr. Derham to the Philosophical 
Transactions, there is one by him on the migration of birds, but 
I can find no paper of his that I can identify with the one he 
refers to above. 
The account he gave of the “ Conical Light ” in the Heavens 
is, no doubt, the one on p. 2,411, Vol. xxv. of the Transactions, 
written about 1708. 
The Leipsick Acta Erudita is a scientific publication in 50 vols., 
begun at Leipsic in 1682, and carried on till 1731. 
Its full title is Acta Eruditorum. 
Hevelius of Dantzic, 1611-1687, was a very celebrated astrono¬ 
mer, who corresponded much with the members of the Royal 
Society, and had great controversies on astronomical matters with 
R. Hooke. 
I cannot follow the Doctor in his reference to a " cut ” or 
illustration by him in Transactions No. 310. This number is 
Vol. 26, viz., the one for April, May and June 1707, and contains 
“ An Account of a Pyramidal appearance in the Heavens near 
Upminster,” by the rev. doctor, but there is no illustration to 
this article. 
