(74) 
nearly fulfilled in the present case"). The only thing that is thus 
neglected is the difference between the influence of the same tempe- 
rature on high and on low barometer-readings, which is extremely small. 
4. The observed rates were first reduced to 760™" and + 10° R. 
by means of previously determined values of the coefficients 6 and c 
in the formula: 
Daily Rate = a + 6 (h—760) + e (t—10°) 
b= + 08.0140 
— — 0 .0268 
The value of 6 was derived from a rigorous discussion of the 
period 1877—1882, in which only rates observed under high and 
‘© 
low barometric pressure during the same month were compared. This 
value must be very near to the truth. In all investigations, not only 
about Honwii 17, but also about other clocks with similar, or 
even with different forms of pendulum, barometer-coefficients have 
always been found of nearly the same amount, and it is not prob- 
able that its value would vary with the time for one and the same 
clock. 
The value 6 == + 0°.0140 has therefore been considered definitive, 
and I have not attempted to improve it. 
The following table gives, for each month from 1877 December 
io 1898 July, the mean observed daily rate, the mean height of the 
barometer and the mean temperature, and, in the column headed 
„Redd. D. R. 1.’, the daily rates reduced to 760™" and + 10° R by 
the formula given above. The meaning of the two last columns 
can only be explained later. 
1) See also the particulars given in connection with the investigation of the 
period 1862—1874, 
