SPECTEE OF DOVER CASTLE. 



137 



was so very singular and unexpected, that at first 

 sight Dr. Vince thought it an illusion ; but upon 

 continuing his observations, he became satisfied 

 that it was a real image of the Castle. Upon 

 this he gave a telescope to a person present, who, 

 Fig. 31. 



upon attentive examination, saw also a very clear 

 image of the Castle as the Doctor had described 

 it. He continued to observe it for about twenty 

 minutes, during which time the appearance re- 

 mained precisely the same ; but rain coming on, 

 they were prevented from making any further 

 observations. Between the observers and the 

 land from which the hill rises there was about 

 six miles of sea, and from thence to the top of 

 the hill there was about the same distance. 

 Their own height above the surface of the water 

 was about seventy feet. 



This illusion derived great force from the re- 

 markable circumstance, that the hill itself did not 

 appear through the image, as it might have been 

 expected to do. The image of the castle was very 

 strong and well defined, and though the rays from 



