Chase.] 



430 



[October. 



"First, the almost exact equality of the Mean Coefficients of Ir- 

 regularity in the three elements With reference to their 



physical import, I think it likely that the equality of Coefficients of 

 Irregularity may hereafter prove to be one of the most important of 

 the facts of observation.* 



" Second, the near agreement in the number of Irregularities for 

 Westerly Force and for Northerly Force. 



"Third, the near agreement in the number of Irregularities for 

 Nadir Force with half the number of Irregularities for Westerly or 

 for Northerly Force;" p. 641-2. 



4. Tables X and XI (p. 643-4) show that the disturbances are 

 greatest in the winter months and in the night hours. Table X, 

 also appears to indicate minima of fluctuations and inequalities in 

 months when there is the greatest uniformity of temperature, and 

 maxima when the changes of temperature are greatest and most 

 frequent. 



5. Tables XI and XIT furnish the materials for the following 

 synopsis : 



" The Soli-tidal character of the principal characteristics of the oc- 

 casional Magnetic Storms, as to frequency, magnitude, inequalities 



wave-disturbance, and Irregularities, is seen clearly in this Table." 

 (Table XII) p. 645. There are subordinate maxima and minima, 

 the consideration of which will become interesting, when the laws of 

 the principals have been well ascertained and defined. 



6. "In regard to the Wave-disturbance : for Westerly Force, the 

 aggregate is + from 17 h. to6h., — from 7 h. to 16 h.; for Northerly 



* This approach to equality appears to be still more important, in view of the 

 proportionality— C : T : : T : M.— P. E. C. 



