[ 6 7 ] 
or not ; and if it did, to note the- circumftanees 
of it. 
The clocks to be obferved by, were fet by the 
Aflronomer Royal, but we were not acquainted with 
the time they were too faff or flow ; and the tele- 
fcope which I obferved with was an excellent achro- 
matic telefcope, magnifying 140 times, inverting the 
obie£l, and made by Mr. Dollond. 
The telefcope being properly adjufled, and having 
a moll clear and diffindt fight of the fun’s limb 
where the external contadl was expe&ed to happen ; 
at ii h 56/ 32" per clock (which, reduced by the 
Aflronomer Royal to apparent time, is y h 10' 33"), 
whilfl I was moving my eye gently along that part 
of the fun’s limb where the contadl was expedted, 
there appeared as though a kind of lucid wave of 
tranfparent matter, of the colour of that part of the 
lucid annulus (which afterwards appeared round 
Venus), which was neareft to the limb of Venus, 
and taking up the fpace of about a fifth part of a 
minute of a degree along the fun’s edge, this lucid 
wave feemed to flrike gently againfl the fun’s limb, 
and in an inflant the little tremulous vibrations on 
the fun’s limb were totally flopt, and that part of the 
limb was rendered thereby a little obfcure. A fecond 
and half of time after this, at th? fame place of the 
fun’s limb, arofe, firfl gently, and then more vio- 
lently, a ferment, or boiling, very different in colour 
as well as magnitude, from the tremulous vibrations 
at other parts of the fun’s limb, for it was darker 
and much more violent, and at 1 i h 56' 36" per 
clock, or 7 h 1 o' 37" apparent time, this fermen-> 
tation was enlarged along the limb of the fun, and 
K 2 the 
* 
