Electricity at the Kew Observatory. 

 Table II. 



101 



In series I there were only twelve observations at station E. In 

 series III the mean ratios for the higher stations are depressed by 

 one abnormally low reading. The means in the different series 

 vary, but the differences are too small fco warrant any positive con- 

 clusion. They indeed suggest the possibility of the potentials at the 

 higher stations being relatively somewhat higher in winter than in 

 summer, but this may arise from a slight want of uniformity in the 

 procedure followed at the different seasons. 



The departures of the maxima and minima in Table II from the 

 means are considerable, but the number of instances in which the 

 departures from the mean are large is in reality small. This will be 

 seen by reference to Table III, which gives the percentage deviations 

 of the ratios from their means, treating each series of observations 

 separately. 



Table III. 

 Percentage Deviations from the Means. 



