[ 3 +« ] 
body in quarter grains; the third the excefs of the 
fpecific gravity of each iolution, above the fpecific 
gravity of water. 
Tab. I. Tab. II. Tab. III. 
263 
0 
263 
0 
883 
0 
9 
2 73 
10 
5 
269 
6 
4 
899 
16 
18 
282 
IQ 
10 
274 
1 1 
8 
9 i 5 
32 
27 
36 
292 
201 
29 
38 
15 
20 
280 
285 
17 
22 
12 
16 
930 
945 
47 
62 
45 
309 
0 
46 
25 
3° 
289 
294 
26 
3 i 
20 
24 
959 
97 i 
76 
88 
35 
300 
37 
28 
985 
102 
40 
304 
41 
32 
996 
u 5 
45 
3°9 
46 
36 
1009 
126 
5 ° 
3 12 
49 
40 
1020 
*37 
55 
3 l6 
53 
The difference of the numbers in the third co- 
lumn of each table from arithmetical progreflions, is 
obvious at firft view, the difference of the two laft 
numbers of each being confiderably lefs than the 
difference between the two firft: and the numbers 
6. n. 22. 41. correfponding to the geometrical 
progreffion 5. 10. 20. 40. in the fecond table as well 
as the numbers 16. 32. 62. 1 13 correfponding to the 
geometrical progreffion 4. 8. 16. 32, in the third, 
differ confiderably from geometrical progreffions, 
whofe common ratio is £. 
In making thefe experiments there are three obvi- 
ous fources of error : the heat may not remain con- 
ffant ; the additional weights of fait may not be ac- 
curately equal ; and the weight of the given body 
may be more or lefs than what is expreffed by any 
quantity 
