252 



EARTHQUAKES. 



Between 1761 and 1800 earthquakes occurred as 

 follows : — 



In Perigee • • . . • 526 

 Apogee . . . • , .465 



The following table shows the results which enabled 

 Perrey to deduce his first law. 



Dividing the period of lunation into quarters, with 

 the time of syzjgies and quadratures as the centres of these 

 quarters, he found that the earthquakes were distributed 

 as follows. 











Difference in 





Totals 



Syzygies 



Quadratures 



favour of the 

 Syzygies 



1843-1847 



1,604 



850-48 



753-52 



69-96 



1848-1852 



2,049 



1,053-53 



995-47 



5806 



1853-1857 



3,018 



1,534-13 



1,483-87 



50-26 



1858-1862 



3,140 



1,60299 



1,537-41 



65-98 



1863-1867 



2,845 



1,463-42 



1,381-58 



8184 



1868-1872 



4,593 



2,333-48 



2,259-52 



73-96 



1843-1872 



17,249 



8,838-03 



8,410-97 



42706 



The reported earthquakes between 1751 and 1843 are 

 shown to conform with the same rule.^ Julius Schmidt, 

 astronomer at Athens, found for the earthquakes of 

 Eastern Europe and adjacent countries for the years 1776 

 to 1873 that there were more earthquakes when the moon 

 was in perigee. Other maxima were at new moon, and 

 two days after the first quarter. There was a diminution 

 at full moon, and a minimum on the day of the last 

 quarter. As one example of results which are antagonistic 

 to the general results obtained by Perrey may be quoted 

 the results of an examination by Professor W. S. Chaplin 

 of the earthquake recorded at the meteorological observa- 

 tory in Tokio. The list of earthquakes, 143 in number, 

 extending over a period of three years, was recorded by one 

 of Palmieri's instruments. The results were as follows : — 



' Am. Jour. Sci. vol. xi. p. 233. 



