421 
ON “QUIET” dans during THE FXEVEN YEARS 1890 TO 1900, FTC. 
years, and 1889, 1890 as the group of sun-spot minimum years in dealing with the 
Wilhehnshaven data. The latter group, it will be noticed, (lifters from that used 
for Kew. 
The Wilhelmsharen data also differ in being from all days in tlie year, and in 
their case one had to employ arithmetic means of tlie c’s from individual years instead 
of employing values answering to the inequality from the group of years coml)ined. 
This last difference would inevitably tend to increase the size of the Wilhehnshaven 
coefficients as compared to the Kew, though probably to but a trifling extent. 
As the declination at Wilhehnshaven is some 41-° less westerly than at Kew, the 
results for N and W at the two places are presumably less directly comparable tlian 
the results for H. 
