[ 222 3 
fleding telefcope of 28 inches focus and 5 inches 
aperture, which magnified about 80 times : the te- 
lefcope was made by Pere Noel. I will not enlarge 
upon the precautions I took for the benefit of my ob~ 
fervations, in order to affume a vain pretenfion of 
having attained to the laft precifion ; it is fufiicient to 
afiiire you, I made them in the beft manner, that the 
circumftances would admit of. Having calculated 
and reduced my obfervations to the Royal Oblerva- 
tory at Paris, I found, that the weftern limb of Venus 
touched the weftern limb of the fun, or, that the lu- 
minous thread of the fun was broke by her, 
h ' " 
At ------ 8 28 29 True time, morn. 
Laft contad, at - - 8 46 43 
Conjundion of o with ? 5 52 20 
Southern latitude of - o 932 
Longitude of *5 being 2* 14 32 23 
I fometimes meafured the diameter of Venus with 
a bad micrometer , but finding there was but little 
account to be made of it, I difcontinued the ufe of it. 
During the obfervation, I had recourfe to different 
coloured glafles ; to wit, a black glafs, fuch as is 
made at glafs-houfes ; a common fmoked glafs, and 
a glafs of a blue and green mixed, half of which was 
flightly fmoked. In uling the black glafs, the difk 
of the fun, and that of Venus, were badly defined, 
and the fpots of the fun appeared but faintly. I faw 
a little better with the common fmoked glafs, and 
with the half-frnoked green and blue glafs : but when 
I viewed 
