60 H. I. JENSEN. 



and Coatepec with debris. This was the beginning of 

 another grand series of disturbances, lasting till November 

 18th, 1892. Yet there is undoubtedly in years of violent 

 disturbances a tendency for these to fall at such times as 

 Mr. Still indicates in his above mentioned letter. 



In September 1902 we had the moon crossing the equator 

 on the 17th, full at the same time, the equinox on the 22nd 

 and perigee on the 23rd, and this combination was accom- 

 panied by a violent and extensive series of disturbances, 

 including earthquakes in Ecuador, Honduras, Guatemala 

 and St. Vincent, and a violent eruption of La Soufriere, all 

 between September 20th and 23rd. The great disturbances 

 of November 15th and 16th may have been precipited by 

 the occurrence of perigee and full moon on those days. We 

 see then that several causes co-operating may bring about 

 what each acting singly was, as on June 13th and October 

 1st 1902, unable to achieve. 



The compilation of earthquakes and eruptions between 

 April 1st, 1902, and December 31st 1903, which is given in 

 Appendix II., contains 55 earthquakes and 46 eruptions. 

 These were collected from Sijdney Morning Herald files 

 and checked by comparison with those recorded from time 

 to time in "Nature." The deductions to be drawn from 

 this list are corroborative of the above contentions. 

 Compiling under the heading " perigee " all the earth- 

 quakes that occurred from 3 days before to 3 days after 

 perigee, aud likewise for apogee, full, new, and moon cross- 

 ing the equator we obtain the following tables. 



Table I. 



Perigee. 



Earthquakes. 



32 



or 58*0^ 



Eruptions. 

 14 



30*57° 



Total disturbances at and 

 about Perigee 46, or about 

 40f. 



Apogee. 



Earthquakes. | Eruptions. 

 8 | 10 



14-5°/° I 18'Of* 



Total disturbances at and 

 about Apogee 18, or about 



18°/°. 



