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tions and of different magnifying powers. This co- 
incidence not only furprized me, but alfo the reve- 
rend Mr. Hornfby, now Savilian profeffor of Agrono- 
my at Oxford. Mr. Hornfby went to Greenwich in 
the beginning of the year 1762, and on his return 
told me, that his furprize was at an end, for he had 
been informed at Greenwich, that Mr. Green, the 
afliftant obferver there, as foon as he judged that the 
internal contadt was formed, called out now. This 
muff certainly have caufed fome difturbance to the 
other obfervers, and might pofiibly influence their 
judgment : and the fadt (as I am informed) was that 
each obferver had a fecond watch in his hand, and 
they inflantly ftoped their watches, each having his 
hand at his watch ready to flop. This problem, 
therefore, is eafily folved, and the furprize at the co- 
incidence entirely vanifhes; fo that this obfervation 
can be looked on as no more than the obfervation of 
one perfon, and he too not much pradtifed in ob- 
ferving. Moreover it is proper I fhould obferve 
that another perfon was prefent at this obfervation, 
who confirmed the above account. 
The very near coincidence of the three obfervers at 
Greenwich, in the time of the external contadt re- 
mains now to be accounted for. Mr. Green did not 
call out at this time, becaufe he was forbid by Dr. 
Bradley, who was prefent, though not in a condition 
to obferve becaufe of his bad flate of health. This 
problem therefore may be folved in the following 
manner. The obfervation of the external contadt 
was undoubtedly more uncertain than the former, 
and yet we find two of the obfervers agreeing to the 
fame fecond, and the third differing only one fecond 
from them. If we attend to the following circum- 
r fiances. 
