12 
REPORT— 1847 * 
With these values we obtain 
Table VI. 
Acid employed. 
Contraction 
calculated. 
Difference. 
SOg + 4aq 
SOg + 5aq 
SOg + 6aq 
SOg + 7aq 
SOg + 9aq 
SOg + 12aq 
SOg +15aq 
0*019483 
0*016066 
0*013669 
0*011894 
0-009442 
0*007212 
0*005833 
— 0*000218 
+ 0*000242 
+ 0-000359 
+ 0*0{X).352 
+ 0*000137 
— 0*000223 
— 0<XX)502 
The mean uncertainty of tJiese values is here only 0*000342, and the most 
.probable error of a single determination equal to 0*000231, or about ^ of 
that previously found. 
Formula (5.) shows, that for such hydrates of sulphuric acid, where the 
number of those with one atom of dry acid combined with atoms of water 
are great in comparison to the value of the constant «, the maximum of con¬ 
traction can be considered equal to 
C=i';.(8.) 
n 
or, m other words, the maximum of contraction M'hich several hydrates of 
sulphuric acid can arrive at with the addition of water is invem;ly propo^ 
hin H of atoms of water, which in these hydrates are com* 
e^uatinn^^rN*" according to the 
tSn of fhSh supposed that with the excep- 
nearlffo wl? T i^ydmtes, the maximum of contractiou very 
the valS^s of M' the following table, which contains 
the v2e i calculated according to formula (8.), when for 
LtpVo^Tfretre’etsto^'^ ““‘-U wltb ^ 
/3'= 0*081196 (1+0*011827).(9-) 
Table VII. 
Acid employed. 
Maximum of 
contract, calcul. 
Difference. 
+ 4aq 
SOg + 5aq 
SOg + 6aq 
^Oj + 7aq 
®Oj + OQq 
J^Og + I2aq 
+ 15aq 
0*020299 
0*016239 ■ 
0*013533 ~ 
0*011585 
0*009022 
0*006766 
0*005413 
— OOOIOS4 
+ 0*000069 
+ 0*000495 
+ 0*000661 
+ 0*000557 
+ 0*000223 
“ 0*000081 
