» 



( asT ) 



dès études ii l'Ecole polytechnique {Parijs 19 Jaimarij 

 1860). Aangenomen voor berigt. 



13e Secretaris berigt, met een' brief van den Heer 

 p. VAN DER STERR (Amsterdam 9 Januarij 1860), 

 ontvangen te hebben Tabellen van waargenomen wa- 

 terhoogten, welke hij der Commissie over de daling 

 van den bodem in Nederland heeft ter hand gesteld. 



Wordt gelezen de volgende brief, ontvangen vair 

 den Heer p. a. bergsma (Utrecht 27 Januarij 

 1860): 



In eeu brief, welken ik voor eenigen tijd van Generaal 

 E. SABiNE ontving, was het volgende berigt bevat: 



// We have recently had a very interesting- case in detail 

 of the coincidence betweeu the phenomena of the solar spots 

 and of the magnetic variations. On the l^' of September 

 last, about the hour of \\^ 20™ A. M. a sudden and 

 very brilliant effusion of bright light, brighter than the 

 disk of the sun itself, was seen by two astronomers, whose 

 observatories are some miles apart, to manifest itself in the 

 large dark spot wbieh at that time was the object of mach 

 attention. The effusion lasted about 5 or 6 minutes. One 

 of the astronomers, visiting Kew a few days afterwards 

 and having in his pocket a memorandum of the tiraes at 

 which he had seen this singular phenomeuon in the sun, 

 was uot a little astonished on examining Ihe photographic 

 traces of the magnetic instruments at Kew, that as nearly 

 as may be at the same instants and lasting about the same 

 duration of time, a very great deflection had taken place 

 in the traces of each of the three magnetic clements." 



Welligt is dit berigt belangrijk genoeg om, door plaat- 

 sing van het medegedeelde uittreksel uit Generaal sabine's 



