[ 7<$i ] 
or Three Degrees out of the Level, I fhall not trouble 
myfelf or others about it 5 only further obferve, that 
when Grounds are declining much, and very uneven, 
if the Table hands horizontal, unlefs the Sight or 
Mark on the lower Part is fo high as its Top makes 
a Level with the upper Part of the Table, which is 
feldom done, or practicable, I do not fee why fuch 
a Strefs fhould be laid on the Inftrument’s being level, 
when neither the View by the Index, nor the Mea- 
fure of the Line, either can be, or is taken horizon- 
tally : If the Sight of the Index hand nearly perpen- 
dicular at every Obfervation, it is more than fuffi- 
cient for any Exa&nefs requifite in a Survey. 
II. A Letter from Richard Richard Ton, M, 2). 
and F.R.S. to Sir Hans Sloane, ^V.R.S.^Co 
inclojing a Taper from William Wright 3 
Surgeon, concerning a large Tiece of the 
' Thigh-bone, which was taken out, and its - 
Tlace fupphed hy a Callus. 
SIR , 
I Take this Opportunity of inquiring after your 
Health by rtiy Son, who waits upon you with 
the inclofed, and Part of the OsFemoris accompany- 
ing it [fee Tab. I. Fig. 6.]. As the Cafe appeared to 
me fomething remarkable, I thought proper to com- 
municate it to you. It was drawn up by Mr. Wright , 
a Surgeon, in Bradford , in the Weft-Riding of this 
County, who performed the Cure 5 and a few Days 
ago. 
