524 POPULAR LECTURES AND ADDRESSES. 



announce as a preliminary result, derived from the 

 first three months of the observations, that the 

 latitude had increased during that time by J sec. 

 at Berlin, and had decreased at Honolulu by 

 almost exactly the same amount. The proposed 

 year's observations, begun in Honolulu on the 

 ist of June, 1891, were completed by Dr. Marcuse, 

 and an elaborate reduction of them by the per- 

 manent Committee of the International Geodetic 

 Union was published a month ago at Berlin. The 

 results are in splendid agreement with those of the 

 European observatories : Berlin, Prag, and Stras- 

 bourg. They prove beyond all question that 

 between May, 1891, and June, 1892, the latitude 

 of each of the three European observatories was a 

 maximum, and of Honolulu a minimum, in the 

 beginning of October, 1891 : that the latitude of 

 the European observatories was a minimum, and 

 of Honolulu a maximum, near the beginning of 

 May, 1892 : and that the variations during the 

 year followed somewhat approximately, simple 

 harmonic law as if for a period of 385 days, with 

 range of about ] sec. above and below the mean 



