BETWEEN SUN-SPOT FREQUENCY AND TERRESTRIAL MAGNETISM. 



181 



factorily for the phenomena observed in 1892 and 1893 is conspicuous. Unlike 

 Pawlowsk and Katharinenburg, Batavia shows, however, no abnormal excess of 

 disturbances in 1898. 



TABLE XXIII. Batavia (Units 1' for D, ly for H and V). 

 Observed less Calculated Values. 



Mauritius (Lat. 20 6' S., Long. 57 33' E.). 



36. Owing to the novelty in some of the features of the Batavia results, 

 examination of the data from a second tropical station seemed desirable. I have 

 accordingly made use of a number of tables of magnetic results* at Mauritius, 

 published in a convenient form in 1899. In D, data are given for the period 

 1875 to 1890, in H for 1883 to 1890, and in V for 1884 to 1890. The shortness of 

 the two latter periods, and the fact that the data are not contemporaneous with 

 those for most of the other stations, are drawbacks, but there is small choice of 

 magnetic data in low latitudes. 



* ' Mauritius Magnetical Reductions,' edited by T. F. CLAXTON, F.R.A.S., Director Royal Alfred 

 Observatory, Mauritius, 1899. 



