[ 2°3 ] 
I fend herewith a Plan of the Camp in its prefent 
Condition, [Tab. I. Fig. i.J that my Defeription 
may the better be underftood ; and I fend along 
with it the Appearance of a particular kind of Halo, 
which was obferv’d at Norwich, on the nth of 
July lad, at y o’Clock in the Evening : the Colours 
were exceeding vivid, and the Centre of it, con- 
trary to what I ever yet favv, was not in the Sun, 
but in the Zenith. 
The Sun's Rays fhone through the Clouds at the 
fame time, as they frequently do when the Sun is 
near the Horizon. In fhort, the Drawing [Tab. I. 
Fig. 2.] which reprefents the Whole, makes any 
farther Defeription of it needlcfs > and 1 (hall only 
add, that I am. 
Dear Sir , 
lour mo (l humble Servant, 
Norwich , Aug. 28. 
1749 - 
William Arderon. 
III. Part of a Letter from Leonard Euler, 
‘Prof. Math, at Berlin, and F. R. S. To 
the Rev. Mr. Cafpar Wetftein, Chaplam to 
his Royal Highnefs the Prince ^ Wales, con- 
cerning the gradual Approach of the Faith, 
to the Sun. Tranfated from the French, by 
S. T. M. D. F. R. S. 
Berlin, June 28. 1749. 
Read Nov. 2 - "\ /T Onfieur le Monnier writes to me, 
jy/Jk that there is, at Leyden, an Ara- 
bic Manufcript of lbnjounis (if I am not miftaken 
C c 2 in 
