3*8 
HISTORY OF MAURITIUS. 
between the Isle of France and Paris; but I believe that I have sufficiently deter¬ 
mined it, by taking the medium of twenty results, which I have drawn from nine 
observations that M. l’Abbe de la Caille has made on the satellites of Jupiter in the 
Isle of France,. I compared these nine observations of the Abbe de la Caille, with 
all the correspondent or approaching observations, made in different places, of which 
I have been able to obtain observations, and the longitude of which, with respect to 
Paris, was pretty well known. The resulting difference of longitude between the Isle 
of France and Paris, in taking a medium between these two determinations, was 
found to be 3 h 40' 45". 
“ I also examined the result of seven observations of the satellites of Jupiter, 
made in the Isle of France, in the year 1751, by M. d’Apres, and I formed nine¬ 
teen results for the difference of longitude between that isle and Paris. The mean 
difference between these nineteen results is found to be 3 h 40' 22", so that taking 
a new medium between the observations of M. d’Apres and those of M. l’Abbe 
de la Caille, the longitude between the Isle of Frsnce and Paris may be computed 
to be about 3 h 40' 35"; approaching somewhat nearer the results drawn from the 
observations of M. l’Abbe de la Caille, than those of M. d’Apres. 
" Supposing this longitude, the following is that of Funchal, as it results from 
the observations of M. Bory. 
<l 1753—December 28. 
Immersion of the first satellite, observed at Funchal, by M. Bory 18 14 54 
Adding for two revolutions - - - - 3; 12 55 7 
The immersion should happen at Funchal 1st of January, 1754 7 10 1 
It was was observed at the Isle of France 1st of January - 12 7 48 
Difference of Funchal and the Isle of France - - 4 57 47 
Difference of the Isle of France and Paris - - - 3 40 35 
Difference, therefore, of Funchal and Paris - - - 11712 
