65 



1838. Aug. 9. — Sounds heard in the mines, passing in the direc- 



tion of the cleavage from south to north ; no oscilla- 

 tions ; the magnetic needle much affected. 

 Aug. 11. — Shock accompanied by a very loud explosion, 

 apparently from the volcanic vent of the Paramo de 

 Ruez. 



1839. May 28. — A severe shock, continued for nearly a minute. 

 Sept. 21. —Ditto. 



Sept. 22.— Ditto. 

 Sept. 28.— Ditto. 



All in the usual direction, from south to north. 

 Oct. 15. — A great number of shocks during the last few 



days. The quantity of rain fallen last month exceeds 



that of any month in the last three years, viz. 15^ inches. 



Natives consider earthquakes to follow the extremes of 



wet or hot weather, 

 Nov. 28.— Ditto. 

 Dec. 13. — Three very violent shocks from the S.S.W. to 



N.N.E. 



1840. Jan. 2. — Strong shocks from the south. 



June 12. — Ditto, the oscillations confined to very narrow 



limits. 

 Aug. 22. — A sharp shock from the south. 

 Dec. 11. — A severe shock from the south, lasted fifty 



seconds; several houses thrown down in Antioquia 



in its line of bearing. 



1841. Mar. 12. — Slight shocks from the usual direction. 

 Mar. 19.— Ditto. 



June 1. — Ditto; the magnetic needle much affected. 



Sept. 8. — A severe shock. 



Sept. 14. — A slight shock. 



Sept. 30.— Ditto. 

 The whole of the above, without exception, were from south 

 to north, and oscillating from east to west. It will therefore be 

 observed that earthquakes are subject to laws of action as uni- 

 form as other natural phenomena. 



In 1797? the district around the volcano of Tunguraqua in 

 Quito, during one of the great meridional shocks, experienced 

 an undulating movement which lasted four minutes. At the 



F 



