[ 3 6 7 ] 
Suits drawn from a great number of experiments. 
Two needles made by different artifts, one at Bade, 
the other at Peterfburg, confequently fufceptible of a 
different magnetic force, produced but very minute 
differences, inevitable in fo delicate experiments ; the 
feveral particulars are recited in the papers I have 
fent to the Peterfburg Academy, from whence it 
may be concluded that it is poffible to determine 
with this instrument the true inclination of the 
magnetic needle, without being any way liable to an 
error of half a degree in the refult, which in my 
experiments is as follows. 
At Peterfburg lat. 59 0 55' longitude 48° the incli- 
nation was in 1769 73°± 
6°. I have moreover Subjoined the feveral particulars 
of my meteorological observations, during my five 
months ff ay in Lapland. Let it Suffice to give you the 
mean height of the barometer, which I found 27 in. 
6,2 lin. (Paris) in March ; 27 in. 5,5 lin. in April j. 
27 in. 7,6 lin. in May; and 27 in. 5,8 lin. in June: 
the mean height for four months being 27 in. 64 lin. 
I could not w r ell meafure exactly my elevation above 
the level of the fea, but I take it not to exceed 40 
or 50 toifes. 
If you think, Sir, this Summary worthy the 
notice of the Royal Society, be fo good as to lay it 
before them. 
I am, dear Sir, 
Your affectionate humble Servant, 
Gourde St. Pierre, mJL. 
At Ponoi 
At Kola 
67 04 
68 54 
5 8 ° 5 1 ' 7 6 i 
49 45 77 * 
Mallet. 
Received. 
