[ J S5 3 
a6tly did fo. Let the diftance determined by Mr. 
Maikeline be only diminished by 2", and his obser- 
vation will perfedtly agree with mine ; but in order 
to make it tally with that of the Cape, it would be 
neceffary to diminish this diftance by 10 or 1 1", and 
it is not very likely that Mr. MaSkeline Sliould have 
committed Such an error. His observation might 
likewiSe be brought to coincide with mine, by mak- 
ing a diminution of 40 or 45" in the Weftern longi- 
tude of St. Helena, as I juft now fettled it ; whereas 
it would be neceffary to take Several minutes from 
that longitude in order to make the observation agree 
with that of the Cape, which does not Seem pofiible. 
Hence, though I don’t take Mr. Malkeline’s obser- 
vation 5 to be*in itfelf absolutely decifive, yet I am 
perfwaded that it adds great weight to the exadtnefs 
of mine. 
Fort St. George at Madrafs is, according to Mr. 
Hirft, 1 3 d 8' North latitude and 3' 4" of time Eaft- 
ward of Pondicherry, and consequently at leaft 5 h 1 2' 54" 
Eaftward of our Obfervatory’s meridian. Mr. Hirft’s 
observation is related in the Philofophical Tranf- 
adtions ; the interval obferved by him between the 
two internal contacts was 5 * 51 ' 4 $", greater by 
2'49 // j| : than that which was obferved at Tobolfk. 
This would give 9" 56 for the Sun’s horizontalparallax, 
a quantity which is about a medium between the Cape 
observation and mine. The comparison between the 
time of observing the contadts, and that of the cor- 
responding observations made in other places, gives 
conclusions fo vaftly different, that I dare not relate 
them here. Mr. Hirft gives a Sufficient account of 
his instruments, but he does not fay whether his 
X 2 pendulum 
