Fig. 3. Monthly Distribution of Earthquakes. Japanese Statistics. 

 Total 216. 



sor E. S. Holden and published bv the Smithsonian Institu- 

 tion, 1898: 



Fig. 4. ]\lonthlv Distribution of Earthquakes. Pacific Coast Statistics. 

 Holden. Total 768. ' 



In 1907 the Smithsonian Institution published Professor 

 Alexander G. McAdie's "Catalogue of Pacific Coast Earth- 

 quakes from 1897 to 1906/' as a supplement to Professor 

 Holden's catalogue referred to above. Professor McAdie's 

 catalogue includes the great San Erancisco earthquake of 

 April 18, 1906. Upon a monthly distribution of this list we 

 obtain the curve shown in Fig. 5. 



While we have given no extra value in the statistics to 

 the earthquake of April 18th, counting it simply as one, the 

 large number of after-shocks SAvells the record considerably 

 for the vernal equinox and for all the later months. The up- 

 lifts in the curve for the vernal equinox and the summer sol- 



42 



