CONTENTS. 
XCVIIE An Account of fome Experiments concern- 
ing the different Refrangibility oj Light. By Mr. 
John Dollond. With a Letter from James Short, 
M. A. F. R. S. Acad. Reg. Suec. Soc. p. 733 .. 
XCiX. An Account of fome extraordinary Effects 
arifing from Consul /ions •> being Part of a Letter 
to John Huxham, M.D. and F.R.S. from William 
Wat foil, M.D. R.S.S. P-743” 
C. An Account of an extraordinary Storm of Hail 
in Virginia. By Francis Fauquier, Eff Lieute- 
nant Governor oj Virginia, and F. R. S. Com- 
municated by William -Fauquier, EJf F.R.S. 
P- 746; 
Cl. An Account of an extraordinary Cafe of a dif- 
eajed Eye : In a Letter to Matthew Maty, M. D. 
F.R.S. By Daniel Peter Layard, M.D. F.R.S. 
P- 747* 
Cl I. An Account of the Heat of the Weather in 
Georgia .: In a Letter from his Excellency Henry 
Ellis, Efq- y Governor oj Georgia, and F. R. S. to 
John Ellis, Efq\ F.R.S. p. 754 . 
C1II. The Invention of a General Method for deter- 
mining the Sum of every 2 d, 3 d, Afh, or $tb., &c. 
F erm of a Series , taken in order , the Sum of the 
whole Series being known. By Thomas Simpfon, 
F.R.S. P-757' 
-CIV. Obfervatio Eclipfs Lima Die 30 Julii 1757. 
habit a Oliflipone a Joanne Chevalier, Congregatio- 
nis Oratorii Prejbytero , e Regia Londinenh So- 
cietate. Communicated by Jacob de Gaftro Sar- 
miento, M. D. F. R. S. p. 769 . 
CV. Singular ObJ'ervations upon the Manchenille 
Apple. By John Andrew Peyffonel, M. D. F. R. S. 
Fran flated from the French. P-77 2 * 
CVE 
