( 270 ) 
while I found for the daily rate for 760 mm. — 05.160. With these 
values we obtain a very good agreement with the observations as 
appears from the differences obs.—comp. contained in the last 
column of the foregoing table. Hence it appears that the value for 
the barometer coefficient 6 == + 05.0157 is determined with great 
precision *). 
For the constant term of the formula we find from all the rates 
—O8.161, while, if we put 6= + 0°.0157 also in formula I, the 
constant term here becomes — O0%.173. 
5. With the formulae thus modified : 
Don. ==" 04.73. 4200157 (4760). 
— 08,0253 (t—10°) + 0500074 (£—10°)*. 
+ Supplementary mequality. . . . . … (Ia). 
D. R. = — 08.161 + 08.0157 (h—760). 
— 08.0220 (t 10°) + Supplem. inequal. và EEN 
we have again compared all the observed rates and this time the 
comparison has been extended to 1902 Sept. 20 i.e. till almost five 
months after the period from which the formulae were derived. 
Besides the observations have been compared with a third calculation. 
This we obtained by applying the formula Ila so that we did 
not use the actual mean temperature but that of five days earlier. 
It is obvious that in doing so also the value of the supplementary 
inequality must be altered. An assumed lagging behind of the 
influence of the temperature of five days is equal, so far as the 
general variation of the temperature (as found above) is concerned, 
to 0.27 X the yearly supplementary term. Hence the latter had to 
be diminished by this part of its amount. The formula thus modified 
I call 115. 
The results of these three comparisons are given in full in the 
following table. The first column gives the dates of the time determi- 
nations, the next column gives the mean temperature for the period 
between the date of one line above and of that on the same line, 
while the third, fourth and fifth columns give the differences between 
the observed rates for those periods and the computations Ia, Ila 
and 114 respectively. These differences are expressed in thousandth 
parts of seconds. 
1) According to the investigations of Mr. Weeper a value little different from 
this follows for the period 1882—1898, 
