&% wb H. “Aletander on the Piet of Vapor of Water. 324 
Ge “Préssiires : Fe Hern persed | F 
ee a ine Toches: tx Observed. | : r_Galewared.—~ Differénces. 
=27°1 12 F, | = 20°73 F. | L738 Fah. 
ee ~10 -98 +2 -02 \ 
bei =] 24 
2°49 -0 -78 
+- 8 -65 10 -76 
16 -27 13 
92-25 41 +45 
+26 -08 +1 -55... +1953 
BOP R65 ee 1 74 
147 + | +3. -32 
174 -58 “S41 +84 
197 -38 0 67 
211 -49 “0-8. oF eae | 
eo Ges of 82 
‘03 -—0 90 
254 -24 1-58 
5 -4 2315 
978 -59 ee OF 
7 297 +464 300 .-42 2 -96 1919 
d= a MS cM earr Serene a inate x dis a, t-O°- 600. 
* “This mean difference (say 0°:61 Faht.) ip thie error of the ee 
mula as compared with the observations above ; which are them- 
selves the mean of more than twice as many experiments, and 
which may be taken as representing impartially the | whole e range 
Mr. Regiault’s results. In arriving at this mean” 
‘Have arranged the several instances into groups whose individu 
‘mean furnish the definitive general one. ‘This is’proper, in view 
“of the different: bi of experiment which the different re 
‘tions of temperature in the respeetive groups rendered necessary. 
* The a riser atta mean of all, however, (09°657 Fahr.) is not 
‘Mnaterially_ variant. It will be seen that up to the point of boil- 
“ing water, the formula-temperatures are generally dower than ex- 
periment ; ’ above that point, they are in general higher. 1 it 
t such a change of sign accords with what might be antici 
and in so far does not diminish the reliability of the formal 
“The Bidisrerice (+-0°-61 F.) would be the absolute error of 
{ the formula, were we to assume the experiments as perfectly ac~ 
curate. ‘Bat they have been already shown to be themsely 
ected by an error of 0°31 F'.; and the absolute error o 
mul la, then, may be either. 0° 30 or 09-92 F.; 
s made sites Ea sum or the difference. 
