[ 485 1 
this place. In the months of February and March, 
by a medium of eight oblervations, I found, that by 
the clock, the ftar Rigel, in every daily revolution, 
palfed 4 min. 2^ feconds of time earlier, in the tele- 
fcope ; and in the latter end of May I found, by fix 
obfervations, (the clock not in the lead; changed or 
altered) on the ftar Spica Virginis, that that ftar, 
in every revolution, palfed 4 min. 5- 1 - fee. earlier, in 
the fame telefcope ; which intervals differ pretty 
nearly 2-f feconds of time from one another. Whether 
this difference arifes from any defedt in the clock, 
or whether it proceeds from any fmall difference of 
velocity of the earth’s motion round its axis, I would 
have been very glad to have endeavoured to find out 
by farther inquiry, had not the death of Mr. S. 
Koenig intervened, and I thereby hindered from con- 
tinuing my obfervations. The above obfervations 
were taken in the obfervatory of his illuftrious High- 
nefs the minor Prince of Orange and Naffau, &c. &c. 
under the dire&ion, and with the approbation of the 
aforefaid Mr. Koenig. After the death of that gen- 
tleman, I petitioned her Royal Highnefs the Princefs 
Governefs of thefe Provinces, &c. that I rqight have 
leave to continue my aftronomical obfervations ; but 
as yet I have not been able to obtain her Royal 
Highnefs’s permiffion : otherwife 1 would have ob- 
ferved this laft comet with more exadtnefs. Had I 
been able to purfue the above-mentioned obfervations, 
I would, for the greater certainty in regard to the 
pendulum, have made ufe of a farther precaution. 
By means of a ftove, with the help of a thermo- 
meter, I would have endeavoured to have kept the 
room (in which the clock flood) in the winter, and 
