[ *44 ] 
IefTer Lion and Cancer, r as far as the 
fmaller Dog. 
h ' " 
At 8 49 36. This Arch quite difappear’d : But 
at the fame time, I Jaw another broad- 
er and brighter Arch under CaJJio - 
pea, feven or eight Degrees high. 
In the Obfervations of October 4th, and in the 
laft, I am certain as to theTime of the Clock: So 
that if it has happen’d that others have obferved the 
fame ‘Phenomena, the Longitudes of Places may- 
be determined by them with greater Exadfnefs than 
by the Satellites of Jupiter, which I take to be the 
principalUfe that may be made of thefeOblervations,, 
elpecially in making Maps of the Northern Coun- 
tries, where thefe Lights more frequently occur. 
VIII. A Letter from Dr. Robert James, 
of Lichfield, to Sir Hans Sloane, 
Bart. Pr. R. S. containing [ome Expe- 
riments made upon Mad Dogs with 
Mercury. 
Lichfield, June 3, 1735-. 
SIR, 
z ' r\ ( 
I N purfuance of your Commands, I here give you 
an Account of fome Experiments that have 
been made upon Mad ‘Dogs with Mercury } which 
I apprehend I have fome Reafon to believe is the 
3 moft 
