510 SCIENTIFIC EECORD FOR 1885. 



December and continuing, though feebly, until the 1st of January, 1823. 

 It produced a " Jokellob," which, taking a westerly course, occasioned 

 considerable damages. 



1823. The eleventh eruption of Katla lasted from the 26th of June to 

 the 23d of July, but was not as violent as the previous ones of the same 

 volcano. A " Jokellob" carried to the east a large quantity of sand 

 and gravel. In the beginning of February of the same year some vol- 

 canic phenomena were observed in the vicinity of the sources of the 

 Skapt4, possibly within the volcano of 1783. 



1826. Earthquake shocks in the north of Iceland during the month 

 of June. 



1829. Earthquake shocks in the south of Iceland on the 21st and 22d 

 of February; nine farms were destroyed. 



1830. Mnth submarine explosion southwest of Beyhjanes, at 4 kilom- 

 eters southwest of Eldeyjarbodi and at 60 kilomejcrs southwest of the 

 point of Reykjanes. The explosions continued from the 13th of March 

 until the month of May. 



1838. Earthquake in the north and south of Iceland, in the north be- 

 tween Skjalfandi and Hunafloij with change of location of hot springs. 



1839. Earthquake at ReyTcjavik, on the 28th of July. 



1845. Eighteenth eruption of Secla, which, commencing on the 2d of 

 September, lasted for seven months. A large quantity of ashes spread 

 over the surrounding country, and a portion was carried by the wind 

 as far as the Shetland islands. The column of ashes, on the 5th of 

 February, 1846, rose, according to Ounnlaugsson, 4,370 meters above 

 the summit of Hecla. The current of lava emitted had a length of 

 11,300 meters, a width of 2,800 meters, and was from 15 to 35 meters 

 thick. J. G. Schythe estimates its bulk as 446,000,000 of cubic meters. 



1855. Feeble earthquake shocks in the north of Iceland. 



1860. Twelfth eruption of Katla. On the 8th of May, between 6 and 

 8 A. M., an earthquake occurred, followed by a "Jokellob," descending 

 from the Katla towards the southeast. On the 11th another "Jokellob" 

 from the Solheimasandr towards the southwest. The eruption ceased 

 on the 27th of May. The "Jokellob" carried such large masses of sand 

 and gravel that a former fishing ground of 30 meters' depth was com- 

 pletely filled up after the eruption. The ashes were transported towards 

 the north into uninhabited regions and did but little damage. On Sep- 

 tember 20, at 7 P. M., an earthquake in the south, moving southwest to 

 northeast. In the night from the 30th to the 31st December one noticed 

 at Reykjavik a movement in the same direction. 



1862. Eruptions in the uninhabited regions north of the VatnajoJcull, 

 but its exact location not known. 



1863. Earthquake at ReylijaviJc, in the night of the 20th to the 21st 

 of April. 



1864. Earthquake at Reykjavik, on the 16th of February. 



