SOLAR PROMINENCES. 



501 



bodies travelling round the sun ; but Herr Gronemann has lately fully dis- 

 cussed the observations, and the drift of his contention is under stated : 



There are valid observations against two items in the support of the 

 old theory viz., the affirmed connection of the evening and morning cones 



- 551. Solar prominences. 



seen on the same night (if the corresponding sides be prolonged), and the 

 participation of the cones in the daily motion of the heavens. The zodiacal 

 light is sometimes seen when daylight has not yet disappeared ; and, on the 

 other hand, it sometimes fails toappear, though there is complete darkness. 

 There would seem to be a real lengthening and shortening. It has been 



