[ *94 ] 
XXVI. ExtraB of a Letter from Mr, 
Humphry Marfhall, o/Weft Bradford, in 
Chefter County, Pennfylvania, to Dr, 
Franklin, fe?it with Sketches cf the Solar 
Spots, dated May 3, 1773. 
Redde, Feb. 3, T T IT A V I N G for fome time declined 
I774 " I. making any more obfervations, on 
the dark fpots that appear on the Sun’s difk, I now 
fend a copy of the figures, I drew of them ; which I 
defire may be prefented to the Royal Society. Per- 
haps fome one or more of the members may be 
pleafed with them, in which cafe, I fhall not think 
my labour loft. They were viewed with a retiediing 
telefcope of inches, and their appearances, I 
think, pretty truly delineated, both as to magnitude 
and fituation. Upon the whole, I am of opinion, 
that the fpots are near the Sun’s furface, if not 
clofely adhering thereto, for thefe reafons ; 1 . That 
their velocities are apparently greatefl near the center, 
and gradually flower towards each limb. 2. That 
the fhape of the fpots varies, according to their pe- 
tition on the feveral parts of the Sun’s difk ; thofe 
that appear broad, and nearly round, when on the 
middle, feeming, at their tirfl appearance on the 
eaftern limb, but as lines ; and, as they advance to- 
wards 
