CONTENTS. 
LXXI. A Letter from John Canton, M. A. and 
F.R.S. to Benjamin Franklin, LL. D. and 
F. R. S. containing fome Remarks on Mr. DelavaH 
E left ri cal Ex peri ments. P • 4 5 7 
LXXII. An Attempt to afjign the caufe , why the Sun 
and Moon appear to the naked Eye larger when they 
are near the Horizon. IVith an Account of fever al 
Phenomena, relative to this Subjeft. Bv Mr. Sa- 
muel Dunn. ' p. 462 
LXXIII. Ext raft of a Letter from Mr. John Bar- 
tram, of Philadelphia, to Benjamin Franklin, 
LL. D. F. R. S. relating to a remarkable Au- 
rora Borealis. p. 474 
LXXIV . Obfervations onnoxious Animals in England ; 
By the Rev. Richard Forfter, M. A. Reftor of 
Shefford in Bucks. p. 4-^ 
LXXV. Extraft of a Letter to the Reverend Thomas 
Birch, D. D. Secretary to the Royal Society , from 
Mr. Abraham Mafon, of Barbadoes, relating to 
an extraordinary Agitation of the Sea there , 31 ft of 
March 1761, and an epidemical Diforder in that 
I /land. p. 4 77 
LXXVI. Obfervations on Aurorae Boreales in Sweden : 
In a Letter to Mr. Benjamin Wilfon, F. R. S. from 
Mr. Thorbern Bergman of\J pfal. p. 479 
LXXVII. An Account of the double Refraftions in 
Cryfahy by Father John Beccaria, Profeffor of 
Experimental Philofphy at Turin. p. 486 
LXXV1II. A Catalogue of the Fifty Plants from Chel- 
fea Garden, prefented to the Royal Society by the 
worf ip ful Company of Apothecaries, for the Fear 1761, 
purjuant to the Direftion of Sir Hans Sloanc Baronet , 
Med: Reg. and See. Reg. nuper Prafes', by John Wil- 
mer. 
